Poly(sarcosine) polymer excipients

ABSTRACT

The present disclosure relates to the field of polymer chemistry and more particularly to poly(sarcosine) polymers and uses thereof. The disclosure is also directed to compositions comprising a protein and a poly(sarcosine) polymer and uses thereof.

CLAIM OF PRIORITY

This application claims priority to U.S. Provisional Application No.63/263,900, filed on Nov. 11, 2021, the entire contents of which ishereby incorporated by reference.

FIELD OF THE DISCLOSURE

This disclosure is directed to the field of polymer chemistry and moreparticularly to poly(sarcosine) polymers and uses thereof. Thedisclosure is also directed to compositions comprising a protein and apoly(sarcosine) polymer and uses thereof.

BACKGROUND

Biological drug products (biologics) are generally large, complexmolecules produced through biotechnology techniques in a living systemsuch as a microorganism, plant cell, or animal cell. Biologics are oftenmore difficult to purify and characterize than small molecule drugs.Despite these challenges, technological advances have led to theemergence of biologics as a crucial category of pharmaceuticals.Biologics are now used for the diagnosis, prevention, and treatment ofdiseases and medical conditions that previously relied on smallmolecules. Currently, the majority of approved and under developmentbiologics are protein-based (protein biologics), with monoclonalantibodies (mAb) representing the largest sub-category. Proteins areinherently fragile molecules, especially when compared to smallmolecules. Conditions such as temperature, pH, ionic strength, light,mechanical stress, and interfacial stress can all cause physical orchemical damage. This can alter the structure of a protein and lead todenaturation and aggregation and may ultimately lead to the loss ofsolubility of a protein. This can be problematic during the entire lifeof a protein biologic. During manufacturing, proteins face stressfulconditions during, e.g., chromatography, mixing, filtration, pumping,filling, and lyophilization. Post-manufacturing, conditions duringshipping, storage, clinical handling and administration can also havenegative impacts on a protein biologic. Protein aggregation anddenaturation increases the cost and complexity of manufacturing and cancreate a bottleneck for drug development. For a final drug product,protein aggregation and denaturation decrease storage conditionflexibility and shelf-life, impedes administration, and can lead toinaccurate dosing.

Critically, protein aggregation has been connected to an increase inadverse immune responses to a biologic protein. Specifically, proteinbiologics can elicit the formation of anti-drug antibodies (ADAs) whichmay have neutralizing activity. Such is the case for tumor necrosisfactor (TNF) blockers Remicade (infliximab) and Humira (adalimumab),whose ADAs have been shown to be 90% and 97% neutralizing respectively(see: van Schie, K. A., et al. Ann. Rheum. Dis. 2015, 74, 311). Thedevelopment of ADAs can lead to the formation of immune complexes whichreduce serum levels of the protein biologic. Other immunologicallyrelated adverse clinical events can manifest as anaphylaxis, cytokinerelease syndrome, infusion reactions, reduced drug efficiency, andcross-reactive neutralization of endogenous proteins mediating criticalfunctions (see: Moussa, E. M., et al. J. Pharm. Sci. 2016, 105, 417). Aprotein biologic can aggregate prior to administration duringmanufacturing, shipment, storage, or preparations for administration.Such pre-administration protein aggregation has been correlated with anincreased risk for the formation of ADAs (see: Kijanka, G., et al. J.Pharm. Sci. 2018, 107, 2847).

Accordingly, protein biologics are formulated with excipients, typicallysurfactants, which are included to abate protein aggregation as well asdenaturation. Surfactant excipients are generally amphiphilic compoundswhich function to lower the surface tension between two phases, such asan air-water interface. Proteins in solution can absorb on to suchinterfaces initiating conformational changes which can lead todenaturation and aggregation. This interfacial stress for a protein insolution can arise from liquid-gas interfaces, such as the headspace ina container and gas bubbles. Liquid-oil interfacial stress between aprotein in solution can arise from the use of lubricating oils (e.g.,silicone oils) with the rubber plunger of pre-filled syringes and therubber vial stoppers used in primary packaging. Liquid-solid interfacesfor a protein in solution are perhaps the most common, which includeinterfaces with the walls of the vial or container, packing materialused in chromatography, filter membranes, mixing devices, tubing used inmanufacturing, and infusion sets, to name a few. Surfactants canoutcompete a protein for such interfaces and prevent proteins frominteracting and absorbing, thus reducing protein denaturation andaggregation. Surfactant excipients protection can be beneficial forprotein biologics formulated as a solution, whether liquid or frozen,and for lyophilized forms.

Polysorbates (PS) are the most prevalent surfactant excipient utilizedin the formulation of protein biologics for the prevention ofdenaturation and aggregation. Polysorbates are nonionic surfactantscomposed of polyethoxylated sorbitan functionalized with a fatty acidester; monolaurate for polysorbate 20 (PS20) and monooleate forpolysorbate 80 (PS80). Despite their wide-spread use, polysorbates havewell-studied problems. Polysorbates are inherently unstable compounds,especially under the conditions in which they are used in proteinformulations (i.e., aqueous solutions for manufacturing and storage).Polysorbates undergo an autooxidation process at the ethylene oxidesubunits and fatty ester that yields reactive hydro- and alkyl-peroxideswhich oxidize proteins (see: Ha, E., et al. J. Pharm. Sci. 2002, 91,2252; Kerwin, B. A. J. Pharm. Sci. 2008, 97, 2924). Through anotherprocess, polysorbates degrade into reactive aldehyde species (e.g.,formaldehyde and acetaldehyde), which also react with proteins (see:Erlandsson, B. Polym. Degrad. Stab. 2002, 78, 571). In addition to theself-degradation pathways, it has been observed that proteinsthemselves, specifically mAbs, catalyze the cleavage of polysorbates toproduce fatty acids, polyethylene glycol (PEG), and pegylated sorbitan(see: Labrenz, S. R. Pharm. Biotechnol. 2014, 103, 2268). Regardless ofthe degradation pathway, polysorbate degradants react with proteins andcan initiate denaturation and aggregation and the associated downstreamproblems.

Polysorbate degradation pathways that produce free PEG are particularlyconcerning. Immunological research has implicated PEG and PEG-containingmaterials with an undesired immunogenic response. This issue isespecially pronounced for parenteral administration, which is the mostcommon method for the delivery of protein biologics (see: Garay, R. etal., Expert Opin. Drug Delivery, 2012, 1319; Yang, Q. et al., Anal.Chem. 2016, 88(23), 11804; Wenande, E. et al., Clin. Exp. Allergy, 2016,46(7), 907; Webster, R. Drug Metab. Dispos, 2007, 35(1), 9).Additionally, PEG-containing pharmaceutical products can produceinfusion-related reactions and anaphylaxis (see: Browne, E. K. et al. J.Pediatr Oncolo. Nurs. 2018, 35(2), 103; Wylon, K., et al., J. AllergyClin. Immunol. 2016, 12(1), 1.).

Accordingly, it would be desirable to develop an excipient to preventthe denaturation and aggregation of proteins which does not utilize PEG.Such excipient would have broad applications in the manufacturing,shipment, storage, and administration of proteins, in particular proteinbiologics.

SUMMARY

The present disclosure is directed to polymers comprising a hydrophilicpoly(sarcosine) chain and hydrophobic aliphatic group, as well ascompositions thereof and related methods of making and using. In someembodiments, such polymers are synthesized by the polymerization ofsarcosine N-carboxyanhydride with a hydrophobic aliphatic amine, or bytreating a poly(sarcosine) polymer with a fatty acid halide, along withother methods described herein and/or known to one of skill in the arts.As described herein, it has been unexpectedly found that certainpolymers and/or compositions of the present disclosure are useful forthe stabilization of proteins through the prevention of aggregateformation and denaturation. Also provided herein are compositionscomprising such polymers and proteins, for use as described herein.Further description of exemplary embodiments of the disclosure isprovided herein in the Drawings, Description, Examples, and Claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 . Temperature ramp study of IgG (1 mg/mL, PBS, pH 7) withhexadecyl polymers of varying poly(sarcosine) lengths (each at 1 mg/mL).

FIG. 2 . Temperature ramp study of IgG (1 mg/mL, PBS, pH 7) with oleylpolymers of varying poly(sarcosine) lengths (each at 1 mg/mL).

FIG. 3 . Temperature ramp study of IgG (1 mg/mL, PBS, pH 7) withpoly(sarcosine)₃₀ polymers with varying hydrocarbon length (each at 1mg/mL).

FIG. 4 . Temperature ramp study of IgG (1 mg/mL, PBS, pH 7) with selectPEG and poly(sarcosine) polymers (each at 1 mg/mL).

FIG. 5 . Temperature ramp study of IgG (20 mg/mL, PBS, pH 7) with selectPEG and poly(sarcosine) polymers (each at 20 mg/mL).

FIG. 6 . Temperature hold study at 50° C. of IgG (20 mg/mL, PBS, pH 7)with select PEG and poly(sarcosine) polymers (each at 1 mg/mL).

FIG. 7 . Temperature ramp study of BSA (20 mg/mL, PBS, pH 7) with selectPEG and poly(sarcosine) polymers (each 20 mg/mL).

FIG. 8 . Temperature ramp study of BSA (20 mg/mL, PBS, pH 7) with selectPEG and poly(sarcosine) polymers (each at 1 mg/mL and 20 mg/mL).

FIG. 9 . Shake Stability Assay of select PEG and poly(sarcosine)polymers at 37° C. with a 200:1 IgG to polymer ratio (w/w).

FIG. 10 . Shake Stability Assay of select PEG and poly(sarcosine)polymers at 37° C. with a 20:1 abatacept to polymer ratio (w/w).

FIG. 11 . Temperature ramp study of IgG (1 mg/mL, PBS, pH 7) with selectPEG and poly(sarcosine) polymers (each at 1 mg/mL).

FIG. 12 . Temperature ramp study of cetuximab (2 mg/mL) with select PEGand poly(sarcosine) polymers (each at 2 mg/mL).

FIG. 13 . Temperature ramp study of bevacizumab (5 mg/mL) with selectPEG and poly(sarcosine) polymers (each at 5 mg/mL).

FIG. 14 . Temperature ramp study of infliximab (1 mg/mL) with select PEGand poly(sarcosine) polymers (each at 1 mg/mL).

FIG. 15 . Temperature ramp study of rituximab (1 mg/mL) with select PEGand poly(sarcosine) polymers (each at 1 mg/mL).

FIG. 16 . Percentage increase in cetuximab particle sizepost-lyophilization with select polymers.

FIG. 17 . Percentage increase in bevacizumab particle sizepost-lyophilization with select polymers.

FIG. 18 . Percentage increase in infliximab particle sizepost-lyophilization with select polymers.

FIG. 19 . Percentage increase in rituximab particle sizepost-lyophilization with select polymers.

FIG. 20 . Post-lyophilization images of cetuximab (0.5 mg/mL) withselect polymers (each at 1 mg/mL).

FIG. 21 . Post-lyophilization images of bevacizumab (0.5 mg/mL) withselect polymers (each at 1 mg/mL).

FIG. 22 . Post-lyophilization images of infliximab (0.5 mg/mL) withselect polymers (each at 1 mg/mL).

FIG. 23 . Post-lyophilization images of rituximab (0.5 mg/mL) withselect polymers (each at 1 mg/mL).

DETAILED DESCRIPTION 1. General Description:

As described herein, the present disclosure features polymers comprisinga hydrophilic poly(sarcosine) chain and a hydrophobic aliphatic group.Such polymers can be synthesized by initiating the polymerization ofsarcosine N-carboxyanhydride with a hydrophobic aliphatic amine or byreacting a poly(sarcosine) polymer with a fatty acid halide, along withother methods.

Polymers of the present disclosure can behave as surfactants and thuslower the surface tension between two phases (e.g., liquid-gas,liquid-solid, etc.). Without wishing to be bound to any particulartheory, it is believed that polymers of the present disclosure mayoutcompete proteins for absorption onto interfaces between two phasesand thus decrease the likelihood for protein adsorption, which can leadto aggregation and denaturation. This property is of critical importancefor pharmaceutical biologic proteins, which encounter such interfacialstresses during manufacturing, storage, and administration. In anembodiment, a protein formulation as a composition comprising saidprotein and a polymer of the present disclosure (e.g., a polymer of anyof Formulas (I)-(V-b) or a salt thereof) exhibits improved stabilityand/or lower aggregation in solution compared with a protein formulationin the absence of a polymer of the present disclosure (e.g., a polymerof any of Formulas (I)-(V-b) or a salt thereof).

In some embodiments, polymers of the present disclosure contain awater-soluble hydrophilic poly(sarcosine) chain and a water-insolublehydrophobic aliphatic portion, such as a hydrocarbon chain. The amidebackbone of the poly(sarcosine) chain can adopt both cis and transconfigurations, while the hydrophobic hydrocarbon chain can oscillatebetween coil configurations (e.g., collapsed and extended). Withoutwishing to be bound to any particular theory, it is believed that thesetwo properties taken together provide polymers of the present disclosurewith the ability to assume the lowest possible energy state at aninterfacial surface, thus preventing adsorption by a protein.

As described herein, the present disclosure is further directed tocompositions comprising a poly(sarcosine) polymer and a protein. Suchcompositions can decrease the aggregation and denaturation of a protein.

2. Definitions:

The following are definitions of various terms used herein to describethe present disclosure and are further illustrated by the embodiments,sub-embodiments, and species disclosed herein. These definitions applyto the terms as they are used throughout this specification unlessotherwise indicated in specific instances, either individually or aspart of a larger group.

For purposes of this disclosure, the chemical elements are identified inaccordance with the Periodic Table of the Elements, CRC Handbook ofChemistry and Physics, 100^(th) Ed. Additionally, general principles oforganic chemistry are described in: Sorrell, T. Organic Chemistry,2^(nd) Ed., Sausalito, University Science Books, 2005; and Smith, M. B.March's Advanced Organic Chemistry: Reactions, Mechanisms, andStructure, 7^(th) Ed., New York, J. John Wiley & Sons, 2001, the entirecontents of which are hereby incorporated by reference.

The term “about” when referring to a measurable value such as an amount,a temporal duration, and the like, refers to variations of ±20% or insome instances ±10%, or in some instances ±5%, or in some instances ±2%,or in some instances ±1%, or in some instances ±0.1% from the specifiedvalue, as such variations are appropriate to perform the presentdisclosures.

It is understood that the terms “CBP-1”, “oleyl-NH-poly(Sar₁₅)”,“oleylamine-Sar₁₅”, “Oleyl-Sar15”,“CH₃(CH₂)₇CH═CH(CH₂)₇CH₂NH-poly(sarcosine)₁₅”, and a polymer having thefollowing structure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-2”, “oleyl-NH-poly(Sar₃₀)”,“oleylamine-Sar₃₀”, “Oleyl-Sar30”,“CH₃(CH₂)₇CH═CH(CH₂)₇CH₂NH-poly(sarcosine)₃₀”, and a polymer having thefollowing structure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-3”, “dodecyl-NH-poly(Sar₂₀)”,“dodecylamine-Sar₂₀”, “Dodecyl-Sar20”,“CH₃(CH₂)₁₀CH₂NH-poly(sarcosine)₂₀”, and a polymer having the followingstructure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-4”, “tetradecyl-NH-poly(Sar₁₅)”,“tetradecylamine-Sar₁₅”, “Tetradecyl-Sar15”,“CH₃(CH₂)₁₂CH₂NH-poly(sarcosine)₁₅”, and a polymer having the followingstructure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-5”, “tetradecyl-NH-poly(Sar₂₀)”,“tetradecylamine-Sar₂₀”, “tetradecyl-Sar20”,“CH₃(CH₂)₁₂CH₂NH-poly(sarcosine)₂₀”, and a polymer having the followingstructure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-6”, “hexadecyl-NH-poly(Sar₃₀)”,“hexadecylamine-Sar₃₀”, “Hexadecyl-Sar30”,“CH₃(CH₂)₁₄CH₂NH-poly(sarcosine)₃₀”, and a polymer having the followingstructure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-7”, “octadecyl-NH-poly(Sar₃₀)”,“octadecylamine-Sar₃₀”, Octadecyl-Sar30”,“CH₃(CH₂)₁₆CH₂NH-poly(sarcosine)₃₀”, and a polymer having the followingstructure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-8”, “didecyl-N-poly(Sar₃₀)”,“didecylamine-Sar₃₀”, “Didecyl-Sar30”,“(CH₃(CH₂)₈CH₂)₂—N-poly(sarcosine)₃O”, and a polymer having thefollowing structure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-9”, “didodecyl-N-poly(Sar₃₀),“didodecylamine-Sar₃₀”, “Didodecyl-Sar30”,“(CH₃(CH₂)₁₀CH₂)₂—N-poly(sarcosine)₃₀”, and a polymer having thefollowing structure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-10”, “oleyl-NH-poly(Sar₁₀)”,“oleylamine-Sar₁₀”, “Oleyl-Sar10”,“CH₃(CH₂)₇CH═CH(CH₂)₇CH₂NH-poly(sarcosine)₁₀”, and a polymer having thefollowing structure:

all represent the same compound and can be used interchangeably.

It is understood that the terms “CBP-11”, “tetradecyl-NH-poly(Sar₂₃)”,“tetradecylamine-Sar₂₃”, “tetradecyl-Sar23”,“CH₃(CH₂)₁₂CH₂NH-poly(sarcosine)₂₃”, and a polymer having the followingstructure:

all represent the same compound and can be used interchangeably.

As used herein, the monomer repeat unit described above is a numericalvalue representing the average number of monomer units comprising thepolymer chain. For example, a polymer represented by (A)₁₀ correspondsto a polymer consisting of ten “A” monomer units linked together. One ofordinary skill in the art will recognize that the number 10 in this casewill represent a distribution of numbers with an average of 10. Thebreadth of this distribution is represented by the polydispersity index(PDI). A PDI of 1.0 represents a polymer wherein each chain length isexactly the same (e.g., a protein). A PDI of 2.0 represents a polymerwherein the chain lengths have a Gaussian distribution. Polymers of thepresent disclosure typically possess a PDI of less than 1.10. In someembodiments, a polymer of the present disclosure has a PDI of about1.01, about 1.02, about 1.03, about 1.04, about 1.05, about 1.06, about1.07, about 1.08, about 1.09, about 1.10., about 1.11, about 1.12, about1.13, about 1.14, about 1.15, about 1.16, about 1.17, about 1.18, about1.19, or about 1.2.

As used herein, the phrase “living polymer chain-end” refers to theterminus resulting from a polymerization reaction which maintains theability to react further with additional monomer or with apolymerization terminator.

As used herein, the term “termination” refers to attaching a terminalgroup to a polymer chain-end by the reaction of a living polymer with anappropriate compound. Alternatively, the term “termination” may refer toattaching a terminal group to an amine or hydroxyl end, or derivativethereof, of the polymer chain.

As used herein, the terms “polymerization terminator”, “terminator”, and“terminating agent” are used interchangeably and refer to a compoundthat reacts with a living polymer chain-end to afford a polymer with aterminal group or alternatively may refer to a compound that reacts withan amine or hydroxyl end, or derivative thereof, of the polymer chain,to afford a polymer with a terminal group. Exemplary polymerizationterminators include anhydrides, sulfonyl halides, and acid halidesincluding, but not limited to, fatty acid halides linoleoyl chloride,lauroyl chloride, myristoyl chloride, palmitoyl chloride, steroylchloride, and oleyl chloride. Further exemplary terminating agentsinclude the acid chloride derivatives of elaidic acid and ricinoelicacid.

The term “leaving group” or “LG” refers to a molecule or atom thatleaves with a pair of electrons during heterolytic bond cleavage.Exemplary leaving groups include halides and carboxylates.

As used herein, the term “polymerization initiator” or “initiator”refers to a compound, which reacts with, or whose anion or free baseform reacts with, the desired monomer in a manner which results inpolymerization of that monomer. Exemplary polymerization initiatorsinclude primary amines, secondary amines, and their corresponding saltsincluding, but not limited to, neopentylamine, benzylamine,4-methoxybenzylamine, N-butylamine, hexylamine, heptylamine, octylamine,decylamine, dodecylamine, tetradecylamine, hexadecylamine,octadecylamine, oleylamine, nonadecylamine, eicosylamine, dihexylamine,dioctylamine, didecylamine, didodecylamine, dioctadecylamine, anddioleylamine.

The term “aliphatic” or “aliphatic group”, as used herein, denotes ahydrocarbon moiety that may be straight-chain (i.e., unbranched),branched, or cyclic (including fused, bridging, and spiro-fusedpolycyclic) and may be completely saturated or may contain one or moreunits of unsaturation, but which is not aromatic. Unless otherwisespecified, aliphatic groups contain 1-30 carbon atoms. In someembodiments, aliphatic groups contain 1-20 carbon atoms. In someembodiments, aliphatic groups contain 8-20 carbon atoms. In otherembodiments, aliphatic groups contain 12-20 carbon atoms. In still otherembodiments, aliphatic groups contain 14-20 carbon atoms, and in yetother embodiments aliphatic groups contain 16-20 carbon atoms. Thenumber of carbon atoms present in the aliphatic groups can also bedefined prior to recitation of said aliphatic group. For example, theterm (C8-C20)aliphatic refers to an aliphatic group as defined hereincomprising from 8 to 20 carbon atoms. It is specifically intended thatthe disclosure includes each and every individual sub-combination of themembers of such range. In particular, the term (C1-C6)aliphatic isintended to include C1 aliphatic (e.g., methyl), C2 aliphatic (e.g.,ethyl, ethylene or ethylyne), C3 aliphatic, C4 aliphatic, C5 aliphaticand C6 aliphatic. Aliphatic groups include, but are not limited to,linear or branched, alkyl, alkenyl, and alkynyl groups, and hybridsthereof such as (cycloalkyl)alkyl, (cycloalkenyl)alkyl or(cycloalkyl)alkenyl. Exemplary aliphatic groups include, but are notlimited to, C24 aliphatic (e.g., didodecyl), C20 aliphatic (e.g.,dodecyl), C18 aliphatic (e.g., oleyl, octadecyl), C16 aliphatic (e.g.,hexadecyl, dioctyl), C14 aliphatic (e.g., tetradecyl), C12 aliphatic(e.g., dodecyl, dihexyl), and C10 aliphatic (e.g., decyl).

The term “hydrophobic aliphatic group” or “hydrophobic aliphatic” asused herein, denotes a moiety which comprises 6 or more carbon atomswhich has an overall hydrophobic characteristic. A hydrophobic aliphaticgroup may be characterized by traits including, but not limited to, astatic water contact angle θ>90°). The number of carbon atoms present inthe hydrophobic aliphatic groups can also be defined prior to recitationof said hydrophobic aliphatic group. For example, the term“(C6-C20)hydrophobic aliphatic group” refers to an aliphatic group asdefined herein comprising from 6 to 20 carbon atoms. Exemplaryhydrophobic aliphatic groups include, but are not limited to, oleyl(i.e., CH₃(CH₂)₇CH═CH(CH₂)₇CH₂—), tetradecyl (i.e., CH₃(CH₂)₁₂CH₂—),hexadecyl (i.e., CH₃(CH₂)₁₄CH₂—), octadecyl (i.e., CH₃(CH₂)₁₆CH₂—),dodecyl (i.e., (CH₃(CH₂)₈CH₂)₂—), and didodecyl (i.e.,(CH₃(CH₂)₁₀CH₂)₂—).

The term “heteroatom” means one or more of oxygen, sulfur, nitrogen,phosphorus, or silicon. This includes any oxidized form of nitrogen,sulfur, phosphorus, or silicon; the quaternized form of any basicnitrogen, or; a substitutable nitrogen of a heterocyclic ring including═N— as in 3,4-dihydro-2H-pyrrolyl, —NH— as in pyrrolidinyl, or ═N(R⁺)—as in N-substituted pyrrolidinyl.

The term “aryl” used alone or as part of a larger moiety as in“aralkyl”, “aralkoxy”, or “aryloxyalkyl”, refers to monocyclic,bicyclic, and tricyclic ring systems having a total of five to fourteenring members, wherein at least one ring in the system is aromatic andwherein each ring in the system contains three to seven ring members.The term “aryl” may be used interchangeably with the term “aryl ring”.

As described herein, compounds of the disclosure may contain “optionallysubstituted” moieties. In general, the term “substituted”, whetherpreceded by the term “optionally” or not, means that one or morehydrogens of the designated moiety are replaced with a suitablesubstituent. In some embodiments, an “optionally substituted” group mayhave a suitable substituent at each substitutable position of the group,and when more than one position in any given structure may besubstituted with more than one substituent selected from a specifiedgroup, the substituent may be either the same or different at everyposition. In some embodiments, an “optionally substituted” group refersto a group having 0-5 substituents independently selected from aspecified group. In some embodiments, an “optionally substituted” grouprefers to a group having 0-3 substituents independently selected from aspecified group. In some embodiments, an “optionally substituted” grouprefers to a group having 0-1 substituents independently selected from aspecified group. Combinations of substituents envisioned by thisdisclosure are preferably those that result in the formation of stableor chemically feasible compounds. The term “stable”, as used herein,refers to compounds that are not substantially altered when subjected toconditions to allow for their production, detection, and, in certainembodiments, their recovery, purification, and use for one or more ofthe purposes disclosed herein.

Monovalent substituents on a substitutable carbon atom of an “optionallysubstituted” group are independently halogen; —(CH₂)₀₋₄R^(∘);—(CH₂)₀₋₄OR^(∘); —O—(CH₂)₀₋₄C(O)OR^(∘); —(CH₂)₀₋₄CH(OR^(∘))₂;—(CH₂)₀₋₄SR^(∘); —(CH₂)₀₋₄Ph, which may be substituted with R^(∘);—(CH₂)₀₋₄O(CH₂)₀₋₁Ph which may be substituted with R^(∘); —CH═CHPh,which may be substituted with R^(∘); —NO₂; —CN; —N₃; —(CH₂)₀₋₄N(R^(∘))₂;—(CH₂)₀₋₄N(R^(∘))C(O)R^(∘); —N(R^(∘))C(S)R^(∘); —(CH₂)₀₋₄N(R^(∘))C(O)NR^(∘) ₂; —N(R^(∘))C(S)NR^(∘) ₂;—(CH₂)₀₄N(R^(∘))C(O)OR^(∘); —N(R^(∘))N(R^(∘))C(O)R^(∘);—N(R^(∘))N(R^(∘))C(O)NR^(∘) ₂; —N(R^(∘))N(R^(∘))C(O)OR^(∘);—(CH₂)₀₋₄C(O)R^(∘); —C(S)R^(∘); —(CH₂)₀₋₄C(O)OR^(∘);—(CH₂)₀₋₄C(O)SR^(∘); —(CH₂)₀₋₄C(O)OSiR^(∘) ₃; —(CH₂)₀₋₄OC(O)R^(∘);—OC(O)(CH₂)₀₋₄SR—, SC(S)SR^(∘); —(CH₂)₀₋₄SC(O)R^(∘); —(CH₂)₀₋₄C(O)NR⁰²;—C(S)NR^(∘) ₂; —C(S)SR^(∘); —SC(S)SR^(∘), —(CH₂)₀₋₄OC(O)NR⁰²;—C(O)N(OR^(∘))R^(∘); —C(O)C(O)R^(∘); —C(O)CH₂C(O)R^(∘);—C(NOR^(∘))R^(∘); —(CH₂)₀₋₄SSR^(∘); —(CH₂)₀₋₄S(O)₂R^(∘);—(CH₂)₀₋₄S(O)₂OR^(∘); —(CH₂)₀₋₄OS(O)₂R^(∘); —S(O)₂NR^(∘) ₂;—(CH₂)₀₋₄S(O)R^(∘); —N(R^(∘))S(O)₂NR^(∘) ₂; —N(R^(∘))S(O)₂R^(∘);—N(OR^(∘))R^(∘); —C(NH)NR^(∘) ₂; —P(O)₂R^(∘); —P(O)R^(∘) ₂; —O P(O)R^(∘)₂; —OP(O)(OR^(∘))₂; SiR^(∘) ₃; —(C₁₋₂₀ straight or branchedalkylene)O—N(R^(∘))₂; or —(C₁₋₂₀ straight or branchedalkylene)C(O)O—N(R^(∘))₂, wherein each R^(∘) may be substituted asdefined below and is independently hydrogen, C₁₋₂₀ aliphatic, —CH₂Ph,—O(CH₂)₀₋₁Ph, or a 5-6-membered saturated, partially unsaturated, oraryl ring having 0-4 heteroatoms independently selected from nitrogen,oxygen, or sulfur, or, notwithstanding the definition above, twoindependent occurrences of R^(∘), taken together with their interveningatom(s), form a 3-12-membered saturated, partially unsaturated, or arylmono- or bicyclic ring having 0-4 heteroatoms independently selectedfrom nitrogen, oxygen, or sulfur, which may be substituted as definedbelow.

Monovalent substituents on R^(∘) (or the ring formed by taking twoindependent occurrences of R^(∘) together with their intervening atoms),are independently halogen, —(CH₂)₀₋₂R^(•), -(haloR^(•)), —(CH₂)₀₋₂OH,—(CH₂)₀₋₂OR^(•), —(CH₂)₀₋₂CH(OR^(•))₂; —O(haloR^(•)), —CN, —N₃,—(CH₂)₀₋₂C(O)R^(•), —(CH₂)₀₋₂C(O)OH, —(CH₂)₀₋₂C(O)OR^(•),—(CH₂)₀₋₂SR^(•), —(CH₂)₀₋₂SH, —(CH₂)₀₋₂NH₂, —(CH₂)₀₋₂NHR^(•),—(CH₂)₀₋₂NR^(•) ₂, —NO₂, —SiR^(∘) ₃, —OSiR^(•)3, —C(O)SR^(•), —(C₁₋₄straight or branched alkylene)C(O)OR^(•), or —SSR^(•) wherein each R^(•)is unsubstituted or where preceded by “halo” is substituted only withone or more halogens, and is independently selected from C₁₋₄ aliphatic,—CH₂Ph, —O(CH₂)₀₋₁Ph, or a 5-6-membered saturated, partiallyunsaturated, or aryl ring having 0-4 heteroatoms independently selectedfrom nitrogen, oxygen, or sulfur. Such divalent substituents on asaturated carbon atom of R^(∘) include ═O and ═S.

Divalent substituents on a saturated carbon atom of an “optionallysubstituted” group include the following: ═O, ═S, ═NNR^(*) ₂,═NNHC(O)R^(*), ═NNHC(O)OR^(*), ═NNHS(O)₂R^(*), =NR^(*), =NOR^(*),—O(C(R^(*) ₂))₂₋₃O—, or —S(C(R^(*) ₂))₂₋₃S—, wherein each independentoccurrence of R^(*) is selected from hydrogen, C₁₋₂₀ aliphatic which maybe substituted as defined below, or an unsubstituted 5-6-memberedsaturated, partially unsaturated, or aryl ring having 0-4 heteroatomsindependently selected from nitrogen, oxygen, or sulfur. Divalentsubstituents that are bound to vicinal substitutable carbons of an“optionally substituted” group include: —O(CR^(*) ₂)₂₋₃O—, wherein eachindependent occurrence of R^(*) is selected from hydrogen, C₁₋₂₀aliphatic which may be substituted as defined below, or an unsubstituted5-6-membered saturated, partially unsaturated, or aryl ring having 0-4heteroatoms independently selected from nitrogen, oxygen, or sulfur.

Suitable substituents on the aliphatic group of R^(*) include halogen,—R^(•), -(haloR^(•)), —OH, —OR^(•), —O(haloR^(•)), —CN, —C(O)OH,—C(O)OR^(•), —NH₂, —NHR^(•), —NR^(•)2, or —NO₂, wherein each R^(•) isunsubstituted or where preceded by “halo” is substituted only with oneor more halogens, and is independently C₁₋₂₀ aliphatic, —CH₂Ph,—O(CH₂)₀₋₁Ph, or a 5-6-membered saturated, partially unsaturated, oraryl ring having 0-4 heteroatoms independently selected from nitrogen,oxygen, or sulfur.

Suitable substituents on a substitutable nitrogen of an “optionallysubstituted” group include R⁺, —NR⁺ ₂, —C(O)R⁺, —C(O)OR⁺, —C(O)C(O)R⁺,—C(O)CH₂C(O)R⁺, —S(O)₂R, —S(O)₂NR⁺2, —C(S)NR⁺ ₂, —C(NH)NR⁺ ₂, or—N(RT)S(O)₂R; wherein each R is independently hydrogen, C₁₋₆ aliphaticwhich may be substituted as defined below, unsubstituted —OPh, or anunsubstituted 5-6-membered saturated, partially unsaturated, or arylring having 0-4 heteroatoms independently selected from nitrogen,oxygen, or sulfur, or, notwithstanding the definition above, twoindependent occurrences of R, taken together with their interveningatom(s) form an unsubstituted 3-12-membered saturated, partiallyunsaturated, or aryl mono- or bicyclic ring having 0-4 heteroatomsindependently selected from nitrogen, oxygen, or sulfur.

Suitable substituents on the aliphatic group of R are independentlyhalogen, —R^(•), -(haloR^(•)), —OH, —OR^(•), —O(haloR^(•)), —CN,—C(O)OH, —C(O)OR^(•), —NH₂, —NHR^(•), —NR^(•) ₂, or —NO₂, wherein eachR⁺ is unsubstituted or where preceded by “halo” is substituted only withone or more halogens, and is independently C₁₋₂₀ aliphatic, —CH₂Ph,—O(CH₂)₀₋₁Ph, or a 5-6-membered saturated, partially unsaturated, oraryl ring having 0-4 heteroatoms independently selected from nitrogen,oxygen, or sulfur.

In some embodiments, an “optionally substituted aliphatic” group refersto an aliphatic group as defined above, that is substituted with 0-40substituents selected from the group consisting of halogen, hydroxy,cyano, nitro, oxo, phenyl, azido, or alkyne wherein said phenyl issubstituted with 0-40 substituents selected from halogen, —CH₃, —CF₂H,—CF₂, —OCH₃ or —OH. For example, an “optionally substituted aliphatic”group may refer to a methyl group that is substituted with a CH₂C6H₅group, i.e., a benzyl group.

Protected hydroxyl groups are well known in the art and include thosedescribed in detail in Wuts, P.G.M. Protecting Groups in OrganicSynthesis, 5^(th) Ed., New York, John Wiley & Sons, 2014, the entiretyof which is incorporated herein by reference. Examples of suitablyprotected hydroxyl groups further include, but are not limited to,esters, carbonates, sulfonates allyl ethers, ethers, silyl ethers, alkylethers, arylalkyl ethers, and alkoxyalkyl ethers. Examples of suitableesters include formates, acetates, proprionates, pentanoates,crotonates, and benzoates. Specific examples of suitable esters includeformate, benzoyl formate, chloroacetate, trifluoroacetate,methoxyacetate, triphenylmethoxyacetate, p-chlorophenoxyacetate,3-phenylpropionate, 4-oxopentanoate, 4,4-(ethylenedithio)pentanoate,pivaloate (trimethylacetate), crotonate, 4-methoxy-crotonate, benzoate,p-benylbenzoate, 2,4,6-trimethylbenzoate. Examples of carbonates include9-fluorenylmethyl, ethyl, 2,2,2-trichloroethyl, 2-(trimethylsilyl)ethyl,2-(phenylsulfonyl)ethyl, vinyl, allyl, and p-nitrobenzyl carbonate.Examples of silyl ethers include trimethylsilyl, triethylsilyl,t-butyldimethylsilyl, t-butyldiphenylsilyl, triisopropylsilyl ether, andother trialkylsilyl ethers. Examples of alkyl ethers include methyl,benzyl, p-methoxybenzyl, 3,4-dimethoxybenzyl, trityl, t-butyl, and allylether, or derivatives thereof. Alkoxyalkyl ethers include acetals suchas methoxymethyl, methylthiomethyl, (2-methoxyethoxy)methyl,benzyloxymethyl, beta-(trimethylsilyl)ethoxymethyl, andtetrahydropyran-2-yl ether. Examples of arylalkyl ethers include benzyl,p-methoxybenzyl (MPM), 3,4-dimethoxybenzyl, O-nitrobenzyl,p-nitrobenzyl, p-halobenzyl, 2,6-dichlorobenzyl, p-cyanobenzyl, 2- and4-picolyl ethers.

Protected amines are well known in the art and include those describedin detail in Wuts, P. G. M. Greene's Protective Groups in OrganicSynthesis, 5^(th) Ed., New Jersey, J. John Wiley & Sons, 2014.Mono-protected amines further include, but are not limited to,aralkylamines, carbamates, allyl amines, amides, and the like. Examplesof mono-protected amino moieties include t-butyloxycarbonylamino(—NHBOC), ethyloxycarbonylamino, methyloxycarbonylamino,trichloroethyloxycarbonylamino, allyloxycarbonylamino (-NHAlloc),benzyloxocarbonylamino (—NHCBZ), allylamino, benzylamino (-NHBn),fluorenylmethylcarbonyl (-NHFmoc), formamido, acetamido,chloroacetamido, dichloroacetamido, trichloroacetamido, phenylacetamido,trifluoroacetamido, benzamido, t-butyldiphenylsilyl, and the like.Di-protected amines include amines that are substituted with twosubstituents independently selected from those described above asmono-protected amines, and further include cyclic imides, such asphthalimide, maleimide, succinimide, and the like. Di-protected aminesalso include pyrroles and the like,2,2,5,5-tetramethyl-[1,2,5]azadisilolidine and the like, and azide.

Protected aldehydes are well known in the art and include thosedescribed in detail in Wuts (2014). Protected aldehydes further include,but are not limited to, acyclic acetals, cyclic acetals, hydrazones,imines, and the like. Examples of such groups include dimethyl acetal,diethyl acetal, diisopropyl acetal, dibenzyl acetal, bis(2-nitrobenzyl)acetal, 1,3-dioxanes, 1,3-dioxolanes, semicarbazones, and derivativesthereof.

Protected carboxylic acids are well known in the art and include thosedescribed in detail in Wuts (2014). Protected carboxylic acids furtherinclude, but are not limited to, optionally substituted C₁₋₂₀ aliphaticesters, optionally substituted aryl esters, silyl esters, activatedesters, amides, hydrazides, and the like. Examples of such ester groupsinclude methyl, ethyl, propyl, isopropyl, butyl, isobutyl, benzyl, andphenyl ester, wherein each group is optionally substituted. Additionalprotected carboxylic acids include oxazolines and ortho esters.

Protected thiols are well known in the art and include those describedin detail in Wuts (2014). Protected thiols further include, but are notlimited to, disulfides, thioethers, silyl thioethers, thioesters,thiocarbonates, and thiocarbamates, and the like. Examples of suchgroups include, but are not limited to, alkyl thioethers, benzyl andsubstituted benzyl thioethers, triphenylmethyl thioethers, andtrichloroethoxycarbonyl thioester, to name but a few.

Unless otherwise stated, structures depicted herein are also meant toinclude all isomeric (e.g., enantiomeric, diastereomeric, and geometric(or conformational)) forms of the structure; for example, the R and Sconfigurations for each asymmetric center, Z and E double bond isomers,and Z and E conformational isomers. Therefore, single stereochemicalisomers as well as enantiomeric, diastereomeric, and geometric (orconformational) mixtures of the present compounds are within the scopeof the disclosure. Unless otherwise stated, all tautomeric forms of thecompounds of the disclosure are within the scope of the disclosure.Additionally, unless otherwise stated, structures depicted herein arealso meant to include compounds that differ only in the presence of oneor more isotopically enriched atoms. For example, compounds having thepresent structures except for the replacement of hydrogen by deuteriumor tritium, or the replacement of a carbon by a ¹³C- or ¹⁴C-enrichedcarbon are within the scope of this disclosure. Such compounds areuseful, for example, as in neutron scattering experiments, as analyticaltools or probes in biological assays.

As used herein, the term “detectable moiety” is used interchangeablywith the term “label” and relates to any moiety capable of beingdetected (e.g., primary labels and secondary labels). A “detectablemoiety” or “label” is the radical of a detectable compound.

“Primary” labels include radioisotope-containing moieties (e.g.,moieties that contain ³²p ³³P ³⁵S, or ¹⁴C), mass-tags, and fluorescentlabels, and are signal-generating reporter groups which can be detectedwithout further modifications.

“Secondary” labels include moieties such as biotin, or protein antigens,that require the presence of a second compound to produce a detectablesignal. For example, in the case of a biotin label, the second compoundmay include streptavidin-enzyme conjugates. In the case of an antigenlabel, the second compound may include an antibody-enzyme conjugate.Additionally, certain fluorescent groups can act as secondary labels bytransferring energy to another compound or group in a process ofnonradiative fluorescent resonance energy transfer (FRET), causing thesecond compound or group to then generate the signal that is detected.

The terms “fluorescent label”, “fluorescent group”, “fluorescentcompound”, “fluorescent dye”, and “fluorophore”, as used herein, referto compounds or moieties that absorb light energy at a definedexcitation wavelength and emit light energy at a different wavelength.Examples of fluorescent compounds include, but are not limited to: AlexaFluor dyes (Alexa Fluor 350, Alexa Fluor 488, Alexa Fluor 532, AlexaFluor 546, Alexa Fluor 568, Alexa Fluor 594, Alexa Fluor 633, AlexaFluor 660 and Alexa Fluor 680), AMCA, AMCA-S, BODIPY dyes (BODIPY FL,BODIPY R6G, BODIPY TMR, BODIPY TR, BODIPY 530/550, BODIPY 558/568,BODIPY 564/570, BODIPY 576/589, BODIPY 581/591, BODIPY 630/650, BODIPY650/665), Carboxyrhodamine 6G, carboxy-X-rhodamine (ROX), Cascade Blue,Cascade Yellow, Coumarin 343, Cyanine dyes (Cy3, Cy5, Cy3.5, Cy5.5),Dansyl, Dapoxyl, Dialkylaminocoumarin,4′,5′-Dichloro-2′,7′-dimethoxy-fluorescein, DM-NERF, Eosin, Erythrosin,Fluorescein, FAM, Hydroxycoumarin, IRDyes (IRD40, RD 700, IRD 800), JOE,Lissamine rhodamine B, Marina Blue, Methoxycoumarin, Naphthofluorescein,Oregon Green 488, Oregon Green 500, Oregon Green 514, Pacific Blue,PyMPO, Pyrene, Rhodamine B, Rhodamine 6G, Rhodamine Green, RhodamineRed, Rhodol Green, 2′,4′,5′,7′-Tetra-bromosulfone-fluorescein,Tetramethyl-rhodamine (TMR), Carboxytetramethylrhodamine (TAMRA), TexasRed, Texas Red-X.

The term “substrate”, as used herein refers to any material ormacromolecular complex to which a polymer can be attached. Examples ofcommonly used substrates include, but are not limited to, glasssurfaces, silica surfaces, plastic surfaces, metal surfaces, surfacescontaining a metallic or chemical coating, membranes (e.g., nylon,polysulfone, silica), micro-beads (e.g., latex, polystyrene, or otherpolymer), porous polymer matrices (e.g., polyacrylamide gel,polysaccharide, polymethacrylate), macromolecular complexes (e.g.,protein, polysaccharide).

Unless otherwise indicated, radioisotope-containing moieties areoptionally substituted hydrocarbon groups that contain at least oneradioisotope. Unless otherwise indicated, radioisotope-containingmoieties contain from 1-40 carbon atoms and one radioisotope. In certainembodiments, radioisotope-containing moieties contain from 10-20 carbonatoms and one radioisotope.

The term “isotopic enrichment” or “isotopically enriched” refers to therelative abundance of an isotope being altered, thus producing a form ofthe element that has been enriched in one particular isotope anddepleted in its other isotopic forms. For example, a C¹⁴ compound issaid to have been isotopically enriched.

The term “as received” when referring to the use of a solvent, reagent,resin, or other component used in a chemical reaction or isolationrefers to their use in the state provided by the manufacturer withoutany additional isolation, and/or purification.

As used herein, the terms “protein” or “polypeptide” refer to a polymerof one or more amino acids which are connected via peptide bonds. Aprotein generally contains greater than 20 such amino acids. The termsinclude a single polypeptide chain or multiple polypeptide chainscomplexed together or covalently bound together (e.g., via disulfidebonds).

As used herein, the terms “drug”, “therapeutic agent”, “pharmaceutical”,“medicine” and derivatives thereof, are used interchangeably and referto a substance intended for use in the diagnosis, cure, mitigation,treatment, or prevention of disease.

As used herein, the terms “protein biologic”, “protein drug”, “proteintherapeutic” and derivatives thereof, are used interchangeably and referto one or more poly(amino acid) chains (e.g., one or more proteins)which are intended for use in the diagnosis, cure, mitigation,treatment, or prevention of disease. Exemplary protein biologics includemonoclonal antibodies, polyclonal antibodies, immunoglobins, fusionproteins, anticoagulants, blood factors, bone morphogenetic proteins,engineered protein scaffolds, enzymes, growth factors, hormones,interferons, interleukins, thrombolytics, insulins, glycosylatedproteins, antigens, antigen subunits, and combinations thereof.

As used herein the term “pH adjuster” refers to any pharmaceuticallyacceptable composition, compound, or agent, suitable for adjusting thepH of the presently described compositions without negatively affectingany property thereof. Suitable pH adjusters can comprise anypharmaceutically acceptable acid or base. Suitable pH adjusters cancomprise hydrochloric acid, sulfuric acid, citric acid, acetic acid,formic acid, phosphoric acid, tartric acid, trolamine, sodium hydroxideand potassium hydroxide.

As used herein the term “preservative” refers to any knownpharmaceutically acceptable preservative that functions by inhibitingbacteria, fungi, yeast, mold, other microbe, and/or by inhibitingoxidation. Suitable preservatives include but are not limited toantimicrobial agents and/or antioxidants. In some embodiments, asuitable preservative is a preservative known in the art for stabilizinga particular vaccine. In some embodiments, a suitable preservative is apreservative known in the art for stabilizing a particular proteinbiologic composition. Suitable antimicrobial agents can include but arenot limited to benzoates, benzyl alcohol, sodium benzoate, sorbates,propionates, and nitrites. Suitable antioxidants can include but are notlimited to vitamin C, butylated hydroxytoluene (BHT), sulphites, andvitamin E.

As used herein, “unit dosage form” or “unit dose form” refers to aphysically discrete unit of a formulation appropriate for the subject tobe treated. It will be understood, however, that the total daily usageof the compositions of the present disclosure will be decided by theattending physician within the scope of sound medical judgement. Thespecific effective dose level for any particular subject or organismwill depend on a variety of factors including the disorder being treatedand the severity of the disorder; activity of specific active agentemployed; specific composition employed; age, body weight, generalhealth, sex and diet of the subject; time of administration, and rate ofexcretion of the specific active agent employed; duration of treatment,drugs/and or additional therapies used in combination or coincidentalwith specific compound(s) employed and like factors well known in themedical arts.

As used herein, a “drug product” means a therapeutic agent, and one ormore “excipients” selected from, but not limited to, tonicity agents,cryoprotectants, stabilizing agents, antiadherents, binders, coatings,colors, disintegrants, flavors, glidants, lubricants, preservatives,sorbents, sweeteners, vehicles, surfactants, and poly(sarcosine)polymers. As appreciated by those skilled in the art, the amounts ofeach excipient will depend on the therapeutic agent, the route ofadministration, the desired biological endpoint, the target cell ortissue.

As used herein, a “cryoprotectant” or “cryoprotective agent” refers tocompounds which either prevent freezing or prevent damage, or alterationto other compounds related to freezing. This includes, but is notlimited to sugars, monosaccharides, disaccharides, polyalcohols, aminoacids, polyvinyl pyrrolidine, polyethylene glycol, mannitol, sorbitol,sucrose, glucose, raffinose, sucralose, lactose, trehalose, dextran, anddextrose.

As used herein, a “surfactant” is a compound capable of lowering thesurface tension between two phases (e.g., air-liquid interface)including, but not limited to, amphiphilic compounds. In certainembodiments, the surfactant is an amphiphilic polymer comprising ahydrophilic poly(sarcosine) chain and a hydrophobic aliphatic chain.

As used herein, a “therapeutically effective amount” means an amount ofa substance (e.g., a therapeutic agent, composition, and/or formulation)that elicits a desired biological response. In some embodiments, atherapeutically effective amount of a substance is an amount that issufficient, when administered as part of a dosing regimen to a subjectsuffering from or susceptible to a disease, disorder, and/or condition,to treat, diagnose, slow the progression of and/or delay the onset ofthe disease, disorder, and/or condition. As will be appreciated by thoseof ordinary skill in this art, the effective amount of a substance mayvary depending on such factors as the desired biological endpoint, thesubstance to be delivered, the target cell or tissue, etc. For example,the effective amount of compound in a formulation to treat a disease,disorder, and/or condition is the amount that alleviates, ameliorates,relieves, inhibits, slows the progression of delays onset of, reducesseverity of and/or reduces incidence of one or more symptoms or featuresof the disease, disorder, and/or condition. In some embodiments, a“therapeutically effective amount” is at least a minimal amount of acompound, or composition containing a compound, which is sufficient fortreating one or more symptoms of a disease or disorder.

The term “subject”, as used herein, means a mammal, and includes humanand animal subjects, such as domestic animals (e.g., horses, dogs, cats,etc.). In an embodiment, the subject is a human.

As used herein, the terms “treatment,” “treat,” and “treating” refer topartially or completely alleviating, inhibiting, delaying onset of,slowing the progression of, ameliorating and/or relieving a disease ordisorder, or one or more symptoms of the disease or disorder, asdescribed herein. In some embodiments, treatment may be administeredafter one or more symptoms have developed. In some embodiments, the term“treating” includes preventing, slowing, or halting the progression of adisease or disorder. In some embodiments, treatment may be administeredin the absence of symptoms. For example, treatment may be administeredto a susceptible individual prior to the onset of symptoms (e.g., inlight of a history of symptoms and/or in light of genetic or othersusceptibility factors). Treatment may also be continued after symptomshave resolved, for example to prevent or delay their recurrence. Thus,in some embodiments, the term “treating” includes preventing relapse orrecurrence of a disease or disorder.

The term “parenteral” or “parenterally” as used herein includessubcutaneous, intravenous, intramuscular, intra-articular,intra-synovial, intrasternal, intrathecal, intrahepatic, intralesionaland intracranial injection or infusion techniques for administration.Preferably, the compositions are administered intraperitoneally orintravenously. Sterile injectable forms of the compositions of thisdisclosure may be aqueous or oleaginous suspension. These suspensionsmay be formulated according to techniques known in the art usingdispersing or wetting agents and suspending agents. The sterileinjectable preparation may also be a sterile injectable solution orsuspension in a non-toxic parenterally acceptable diluent or solvent,for example as a solution in 1,3-butanediol. Among the acceptablevehicles and solvents that may be employed are water, Ringer's solutionand isotonic sodium chloride solution.

The term “in solution” when in reference to a protein, refers to aliquid medium in which the protein is distributed continuously forming ahomogenous mixture.

3. Description of Exemplary Embodiments

3.1 Polymers

In some aspects, the present disclosure relates to polymers comprising ahydrophilic poly(sarcosine) chain and a hydrophobic aliphatic group. Incertain embodiments, the disclosure provides a polymer of Formula I:

or a salt thereof, wherein:R^(1a) an optionally substituted (C1-C20)aliphatic group;R^(1b) is H or an optionally substituted (C1-C20)aliphatic group;R² is H or an optionally substituted (C1-C20)aliphatic group; andx is 5-250.

In certain embodiments, the disclosure provides a polymer of Formula I:

wherein:R^(1a) an optionally substituted (C1-C20)aliphatic group;R^(1b) is H or an optionally substituted (C1-C20)aliphatic group;R² is H or an optionally substituted (C1-C20)aliphatic group; andx is 5-250.

In some embodiments, the present disclosure relates to polymers ofFormula I wherein R^(1a) is an aliphatic group that comprises 1 or morecarbon atoms which has an overall hydrophobic characteristic. In someembodiments, the present disclosure relates to polymers of Formula Iwherein R^(1b) is an aliphatic group that comprises 1 or more carbonatoms which has an overall hydrophobic characteristic. In someembodiments, the present disclosure relates to polymers of Formula Iwherein R² is an aliphatic group that comprises 1 or more carbon atomswhich has an overall hydrophobic characteristic.

In some embodiments, R^(1a) is an aliphatic group that comprises analkenyl group (e.g., a (C2-C20)alkenyl). In some embodiments, R^(1b) isan aliphatic group that comprises an alkenyl group (e.g., a(C2-C20)alkenyl). In some embodiments, In some embodiments, R^(1a) is Hand R^(1b) is an aliphatic group that comprises an alkenyl group (e.g.,a (C2-C20)alkenyl). In some embodiments, R^(1b) is an aliphatic groupthat comprises an alkenyl group (e.g., a (C2-C20)alkenyl) and R^(1a) isH. In any and all embodiments, an alkenyl group contains a double bondthat may have cis or trans geometry. In any and all embodiments, analkenyl group comprises all Z and E double bond isomers and all Z and Econformational isomers.

As described above, the present disclosure relates to polymers whereinthe hydrophilic chain comprises a polymer of N-methyl glycine (i.e.poly(sarcosine)). The present disclosure further contemplates otherN-alkyl glycines which could be used to produce a water-soluble chain(see: Robinson, J. W. et al. Macromolecules 2013, 46(3), 580). In someembodiments, the present disclosure includes polymers wherein thehydrophilic chain is poly(N-methyl glycine), poly(N-ethyl glycine),poly(N-{n-propyl}) glycine, poly(N-isopropyl) glycine, or poly(N-allyl)glycine. In some aspects, the present disclosure also includes mixturesof two or more N-alkyl glycines used to construct the water-solublechain, such as a mixture of N-methyl glycine and N-ethyl glycine.

Also as described above, in some embodiments one or more of R^(1a),R^(1b), and R² in a polymer of Formula I are optionally andindependently substituted. For instance, in some embodiments, suchoptional and independent substitutions envisioned by the presentdisclosure include, but are not limited to, optionally substitutedbenzyl groups, optionally substituted hydrocarbons, optionallysubstituted silyl groups, poly(amino acid) polymers, poly(ethyleneglycol) polymers, poly(N-isopropylacrylamide) polymers, poly(acrylamide)polymers, poly(2-oxazoline) polymers, poly(ethylenimine), poly(acrylicacid) polymers, poly(methacrylate) polymers, poly(vinyl alcohol)polymers, poly(vinylpyrrolidone) polymers, and their corresponding aminesalts. In some embodiments, each of R^(1a), R^(1b), and R² is optionallyand independently substituted with (C1-C20)alkyl, (C2-C20)alkenyl,(C2-C20)alkynyl, halogen, hydroxy, cyano, or oxo. In some embodiments,R^(1a) is optionally and independently substituted with (C1-C20)alkyl,(C2-C20)alkenyl, (C2-C20)alkynyl, halogen, hydroxy, cyano, or oxo. Insome embodiments, R^(1b) is optionally and independently substitutedwith (C1-C20)alkyl, (C2-C20)alkenyl, (C2-C20)alkynyl, halogen, hydroxy,cyano, or oxo. In some embodiments, R² is optionally and independentlysubstituted with (C1-C20)alkyl, (C2-C20)alkenyl, (C2-C20)alkynyl,halogen, hydroxy, cyano, or oxo.

In some embodiments, the R^(1a) aliphatic group is selected from(C1-C20)alkyl, (C2-C20)alkenyl, (C2-C20)alkynyl or (C3-C20)cycloalkyl,wherein the (C1-C20)alkyl, (C2-C20)alkenyl, (2-20) alkynyl, or(C3-C20)cycloalkyl are substituted with 0-20 halogen, hydroxy, cyano,nitro, oxo or phenyl, wherein said phenyl is substituted with 0-3substituents selected from halogen, —CH₃, —CF₂H, —CF₃, —OCH₃ or —OH.

In some embodiments, the R^(1a) aliphatic group is as defined anddescribed above, and has at least one point of unsaturation. In somesuch embodiments, R² is H.

In some embodiments, the R^(1b) aliphatic group is selected from(C1-C20)alkyl, (C2-C20)alkene, (C2-C20)alkyne or (C3-C20)cycloalkyl,wherein the (C1-C20)alkyl, (C2-C20)alkenyl, (C2-C20)alkynyl or(C3-C20)cycloalkyl are substituted with 0-20 halogen, hydroxy, cyano,nitro, oxo or phenyl groups, wherein said phenyl is substituted with 0-3substituents selected from halogen, —CH₃, —CF₂H, —CF₃, —OCH₃ or —OH.

In some embodiments, the R^(1b) aliphatic group is as defined anddescribed above, and has at least one point of unsaturation. In somesuch embodiments, R² is H.

In some embodiments, R^(1a) is an aliphatic group selected from(C1-C20)alkyl and (C2-C20)alkenyl, R^(1b) is H, and R² is H. In someembodiments R^(1a) is an aliphatic group is selected from (C1-C20)alkyland (C2-C20)alkenyl, R^(1b) is an aliphatic group is selected from(C1-C20)alkyl and (C2-C20)alkenyl, and R² is H. In some embodimentsR^(1a) is an aliphatic group is selected from (C1-C20)alkyl and(C2-C20)alkenyl, R^(1b) is an aliphatic group is selected from(C1-C20)alkyl and (C2-C20)alkenyl, and R² is an aliphatic group isselected from (C1-C20)alkyl and (C2-C20)alkenyl.

In some embodiments, the present disclosure envisions substitutions atR^(1a), R^(1b), and R² of a polymer of Formula I which may addfunctionality which would otherwise not be present, including, but notlimited to, a detectable moiety, a fluorescent label, or a substrate.Those skilled in the art will recognize that isotopically enrichedmaterials can be useful probes in biological assays, such asquantitative whole-body autoradiography (QWBA) assays useful fordetermining the distribution of a composition in an animal. In certainembodiments, Ria, R^(1b), or R² is isotopically enriched. In someembodiments, R^(1a) contains a ¹⁴C isotopically enriched hydrocarbon. Insome embodiments, R² contains a ¹⁴C isotopically enriched hydrocarbon.

In certain embodiments, the disclosure provides a polymer of Formula II:

or a salt thereof, wherein:R is an optionally substituted (C12-C20)hydrophobic aliphatic group; andx is 5-50.

In certain embodiments, the disclosure provides a polymer of Formula II:

wherein:R is an optionally substituted (C12-C20)hydrophobic aliphatic group; andx is 5-50.

In some such embodiments, R is CH₃—(CH₂)_(y)—, wherein y is 11-19.

In some such embodiments, R is CH₃(CH₂)₇CH═CH(CH₂)₇CH₂—.

In some such embodiments, x is 15. In some such embodiments, x is 30.

In certain embodiments, the disclosure provides a polymer of FormulaIII:

or a salt thereof, wherein:R^(1a) is an optionally substituted (C6-C20)hydrophobic aliphatic group;R^(1b) is an optionally substituted (C6-C20)hydrophobic aliphatic group;and x is 5-50.

In certain embodiments, the disclosure provides a polymer of FormulaIII:

wherein:R^(1a) is an optionally substituted (C6-C12)hydrophobic aliphatic group;R^(1b) is an optionally substituted (C6-C12)hydrophobic aliphatic group;and x is 5-50.

In some such embodiments, R^(1a) is CH₃—(CH₂)_(y)—, R^(1b) isCH₃—(CH₂)_(z)—, y is 5-19, and z is 5-19. In some such embodiments,R^(1a) is CH₃—(CH₂)_(y)—, R^(1b) is CH₃—(CH₂)_(z)—, y is 5-11, and z is5-11.

In certain embodiments, the disclosure provides a polymer of Formula IV:

or a salt thereof, wherein:R^(1a) is an optionally substituted (C1-C6)aliphatic group;R^(1b) is H, or an optionally substituted (C1-C6)aliphatic group; R² isan optionally substituted (C11-19)hydrophobic aliphatic group; and x is5-50.

In certain embodiments, the disclosure provides a polymer of Formula IV:

wherein:R^(1a) is an optionally substituted (C1-C6)aliphatic group;R^(1b) is H, or an optionally substituted (C1-C6)aliphatic group;R² is an optionally substituted (C11-19)hydrophobic aliphatic group; andx is 5-50.

In some such embodiments, R² is —(CH₂)_(y)—CH₃, wherein y is 10-18.

In some such embodiments, R² is —(CH₂)₇CH═CH(CH₂)₇CH₃.

In some embodiments, the disclosure provides a polymer selected fromFormula (V-a) or (V-b):

or a salt thereof, wherein x is 2-250.

In some embodiments, the disclosure provides a polymer of the followingstructure:

or a salt thereof, wherein x is 5-90.

In some embodiments, the disclosure provides a polymer of the followingstructure:

wherein x is 5-90.

For any of Formulas (V-a) and (V-b), in some such embodiments, x isbetween 5-80, 5-75, 5-70, 5-65, 5-60, 5-55, 5-50, 5-45, 5-40, 5-35,5-30, 5-25, 5-20, 5-15, and 5-10. In some such embodiments, x is between10-90, 10-85, 10-80, 10-75, 10-70, 10-65, 10-60, 10-55, 10-50, 10-45,10-40, 10-35, 10-30, 10-25, 10-20, and 10-15. In some such embodiments,x is between 20-90, 20-75, 20-60, 20-50, 20-35, 25-90, 25-75, 25-50,30-90, 30-60, 35-90, 35-80, 35-70, 35-60, 35-50, 40-90, 45-70, 50-90,and 50-75.

In some such embodiments, x is greater than 10. In some suchembodiments, x is greater than 20. In some such embodiments, x isgreater than 30. In some such embodiments, x is greater than 40. In somesuch embodiments, x is greater than 50. In some such embodiments, x isgreater than 60. In some such embodiments, x is greater than 70. In somesuch embodiments, x is greater than 80. In some such embodiments, x isgreater than 90. In some such embodiments, x is greater than 100. Insome such embodiments, x is less than 100. In some such embodiments, xis less than 90. In some such embodiments, x is less than 80. In somesuch embodiments, x is less than 70. In some such embodiments, x is lessthan 60. In some such embodiments, x is less than 50. In some suchembodiments, x is less than 40. In some such embodiments, x is less than30. In some such embodiments, x is less than 20. In some suchembodiments, x is less than 10.

In some such embodiments, x is 5. In some such embodiments, x is 10. Insome such embodiments, x is 15. In some such embodiments, x is 20. Insome such embodiments, x is 25. In some such embodiments, x is 30. Insome such embodiments, x is 35. In some such embodiments, x is 40. Insome such embodiments, x is 45. In some such embodiments, x is 50. Insome such embodiments, x is 55. In some such embodiments, x is 60. Insome such embodiments, x is 65. In some such embodiments, x is 70. Insome such embodiments, x is 75. In some such embodiments, x is 80. Insome such embodiments, x is 85. In some such embodiments, x is 90.

In some embodiments, the present disclosure provides a polymer of any ofthe following structures for use in accord with the present invention:

In some embodiments, the present disclosure provides a polymer of thefollowing structure:

In some embodiments, the present disclosure provides a polymer of thefollowing structure:

In some embodiments, the present disclosure provides a polymer of thefollowing structure:

In some embodiments, the present disclosure provides a polymer of thefollowing structure:

In some embodiments, the present disclosure provides a polymer of thefollowing structure:

In some embodiments, the present disclosure provides a polymer of thefollowing structure:

In some embodiments, the present disclosure provides a polymer of thefollowing structure:

3.2 Synthesis of Polymers

In certain embodiments the disclosure provides methods for preparing apolymer of Formula II. One embodiment of a general method for preparingsaid polymer is depicted in Scheme 1 and comprises initiatingpolymerization of sarcosine NCA (Formula VI) with a suitableamine-containing initiator (Formula V) to provide a polymer of FormulaII.

Those skilled in the art will recognize that many amines of Formula Vcan serve as initiators for the polymerization of sarcosine NCA.Initiators of Formula V envisioned by the disclosure include optionallysubstituted (C12-C20)hydrophobic aliphatic amines and theircorresponding amine salts derived from anions including, but not limitedto, halides, organic acids (e.g., acetic acid, trifluoroacetic acid),and tetrafluoroborate.

In some embodiments, the initiator of Formula V is an alkyl amine ofFormula Va:

wherein x=11-19.

In some embodiment, the initiator of Formula V is oleylamine (i.e.,CH₃(CH₂)₇CH═CH(CH₂)₇CH₂—NH₂).

In certain embodiments the disclosure provides methods for preparing apolymer of Formula III. One embodiment of a general method for preparingsaid polymer is depicted in Scheme 2 and comprises initiatingpolymerization of sarcosine NCA of Formula VI with a suitable secondaryamine-containing initiator of Formula VII, to provide a polymer ofFormula III, wherein each of R^(1a), R^(1b), and x are defined anddescribed herein.

Those skilled in the art will recognize that many secondary amines ofFormula VII can serve as initiators for the polymerization of sarcosineNCA depicted in Scheme 2. Initiators of Formula VII envisioned by thedisclosure include those in which R^(1a) is an optionally substituted(C6-C20)hydrophobic aliphatic group and R^(2a) is optionally substituted(C6-C20)hydrophobic aliphatic group. In some embodiments the initiatorof Formula VII is an amine salt derived from anions including, but notlimited to, halides, organic acids (e.g., acetic acid, trifluoroaceticacid), and tetrafluoroborate.

In some embodiments, the initiator of Formula VII is an alkyl secondaryamine of the structure Formula VIIa:

wherein: x=5-19; and y=5-19. In some embodiments, x=6-12; and y=6-12.

In certain embodiments the disclosure provides methods for preparing apolymer of Formula IV. One embodiment of a general method for preparingsaid polymer is depicted in Scheme 3 and comprises the following steps:(1) initiating polymerization of sarcosine NCA of Formula VI with asuitable amine-containing initiator of Formula VII, and (2) adding aterminating agent represented by Formula VIII to provide a polymer ofFormula IV, wherein each of R^(1a), R^(1b), R², LG, and x are definedand described herein.

Those skilled in the art will recognize that many amines of Formula VIIcan serve as initiators for the polymerization of sarcosine NCA depictedin Scheme 3. Initiators of Formula VII envisioned by the disclosureinclude those in which R^(1a) is an optionally substituted(C1-C6)aliphatic group, and R^(2a) is H, or an optionally substituted(C1-C6)aliphatic group. In some embodiments the initiator of Formula VIIis an amine salt derived from anions including, but not limited to,halides, organic acids (e.g., acetic acid, trifluoroacetic acid), andtetrafluoroborate.

In some embodiments, the initiator of Formula VII is neopentylamine,N-butylamine, or benzylamine.

Those skilled in the art will recognize that many terminating agents, inaddition to those of Formula VIII, are capable of reacting with theterminal amine of a compound represented by Formula III and itscorresponding anion. Terminating agents envisioned by the disclosureinclude anhydrides, sulfonyl halides, other acylating agents, and othergroups that contain a leaving group (LG) that is susceptible tonucleophilic displacement.

In some embodiments, the terminating agent is an acyl chloride ofFormula VIIIa represented by the following structure:

wherein x is an optionally substituted (C12-C20)hydrophobic aliphaticgroup.

In some embodiments, the terminating agent of Formula VIII is oleylchloride (i.e., CH₃(CH₂)₇CH═CH(CH₂)₇CO—C1).

Those skilled in the art will recognize that treatment of a compound ofFormula III with a terminating agent may be performed at the conclusionof the polymerization with sarcosine NCA of Formula VI without theisolation of a compound of Formula III in a process described as a“one-pot” synthesis. Alternatively, treatment with a terminating groupmay be performed after isolation of a compound of Formula III from areaction mixture in a “multi-step” process. In certain embodiments, acompound of Formula IV is prepared in a one-pot process. In certainembodiments, a compound of Formula IV is prepared in a multi-stepprocess.

In certain embodiments, the sarcosine NCA is added to a solution of thepolymerization initiator. In certain embodiments, the polymerizationinitiator is added to a solution of sarcosine NCA.

In certain embodiments, the sarcosine NCA is added as a solid.

In certain embodiments, sarcosine NCA is added as a solution. In certainembodiments, sarcosine NCA is added as an N,N-dimethylacetamide (DMAc)solution. In certain embodiments, sarcosine NCA is added as anN,N-dimethylformamide (DMF) solution.

In certain embodiments, the process depicted in Scheme 1, Scheme 2, orScheme 3 is performed in a single solvent. In certain embodiments, thesolvent will be capable of solubilizing the starting materials, livingpolymerization chain, and the final polymer such that all the materialremains in solution for the duration of the process. In someembodiments, a suitable solvent comprises an amide-containing solvent.In certain embodiments the solvent is or comprises N,N-dimethylformamide(DMF). In certain embodiments, the solvent is or comprisesN,N-dimethylacetamide (DMAc).

One skilled in the art will recognize that many amines are suitable forthe initiation of a polymerization reaction with sarcosine NCA in aprocess depicted in Scheme 1, Scheme 2, or Scheme 3. Initiatorsenvisioned by the present disclosure include, but are not limited to,optionally substituted benzylamines, optionally substituted hydrocarbonamines, optionally substituted silylamines, poly(amino acid) polymers,poly(ethylene glycol) polymers, poly(N-isopropylacrylamide) polymers,poly(acrylamide) polymers, poly(2-oxazoline) polymers,poly(ethylenimine), poly(acrylic acid) polymers, poly(methacrylate)polymers, poly(vinyl alcohol) polymers, poly(vinylpyrrolidone) polymers,and their corresponding amine salts.

In some embodiments, the disclosure relates to a method to prepare acompound of Formula I, Formula II, Formula III, or Formula IV usingreagents, solvents, resins, and other components used in a chemicalreaction or isolation as received. In some embodiments, said compound isprepared without measures taken to exclude air and/or moisture (e.g.,Schlenk techniques). Those skilled in the art will appreciate theadvantage of NCA polymerization reactions under these conditions as itreduces costs and increases the robustness of such processes.

The present disclosure also relates to the isolation of a polymer ofFormula I, Formula II, Formula III, or Formula IV from a reactionmixture using anti-solvent. In some embodiments, isolation occurs usinga single anti-solvent. In some embodiments, the ratio of reactionmixture to anti-solvent is such to minimize the total amount used. Thoseskilled in the art will recognize the advantage of using a minimalamount of anti-solvent as it reduces cost and complexity and increasesthe scale of preparation. Such reaction mixture to anti-solvent ratioscontemplated by the present disclosure include, but are not limited to,1:0.25, 1:0.5, 1:1, 1:1.5, 1:2, 1:3, 1:4, 1:5, 1:10.

The present disclosure also relates to the use of a single reactionsolvent and a single anti-solvent. Those skilled in the art willrecognize the advantage of using only two solvents total for thepreparation of a compound of Formula I, Formula II, Formula III, orFormula IV, as this will minimize costs, especially on commercial scaleunder Good Manufacturing Practice (GMP) guidance, as a minimal number ofsolvents will need to be sourced and quantified during release testing.In certain embodiments the anti-solvent is selected from a listincluding, but not limited to, a ketone-containing solvent, ahydroxyl-containing solvent, an ester-containing solvent, anether-containing solvent, a hydrocarbon solvent, an aromatic solvent,and an aqueous solvent.

Anti-solvents envisioned in the disclosure include, but are not limitedto, methyl ethyl ketone, acetone, butanone, ethanol, methanol,isopropanol, butanol, tert-butanol, methyl acetate, butyl acetate,diethyl ether, dioxane, tetrahydrofuran, hexane, heptane, toluene,water, and aqueous buffer solutions. In some embodiments, theanti-solvent is tert-butyl methyl ether. In some embodiments, theanti-solvent is ethyl acetate.

The present disclosure also relates to the treatment of a polymer ofFormula I, Formula II, Formula III, or Formula IV to a lyophilizationprocess. In some embodiments, the lyophilization is performed from anaqueous solution. In certain embodiments, the lyophilization isperformed from an aqueous solution containing tert-butanol.

The present disclosure also relates to the treatment of a polymer ofFormula I, Formula II, Formula III, or Formula IV to a spray-dryingprocess. In some embodiments, the spray-drying is performed from anaqueous solution. In certain embodiments, the lyophilization isperformed from an aqueous solution containing tert-butanol. In certainembodiments, the lyophilization is performed from methanol.

3.3 Polymer and Protein Compositions

In certain embodiments, the present disclosure relates to compositionscomprising a protein and polymer of Formula I, Formula II, Formula III,or Formula IV. Without wishing to be bound by any particular theory, itis believed that polymers of the present disclosure outcompete proteinsfor absorption onto interfaces between two phases and thus decrease thelikelihood for protein adsorption which can lead to aggregation anddenaturation. This property is of critical importance in formulatingpharmaceutical biologic proteins which encounter such interfacialstresses during manufacturing, storage, and administration.

In some embodiments, the present disclosure provides compositionscomprising:

(i) a polymer of Formula I:

-   -   or a salt thereof, wherein:    -   R^(1a) is an optionally substituted (C1-C20)aliphatic group;    -   R^(1b) is H or an optionally substituted (C1-C20)aliphatic        group;    -   R² is H or an optionally substituted (C1-C20)aliphatic group;        and    -   x is 5-250; and

(ii) a protein.

In some embodiments, the present disclosure provides compositionscomprising:

(i) a polymer of Formula I:

-   -   wherein:    -   R^(1a) is an optionally substituted (C1-C20)aliphatic group;    -   R^(1b) is H or an optionally substituted (C1-C20)aliphatic        group;    -   R² is H or an optionally substituted (C1-C20)aliphatic group;        and    -   x is 5-250; and

(ii) a protein.

In some embodiments, a composition comprises:

(i) a polymer of Formula II:

-   -   or a salt thereof, wherein:    -   R is an optionally substituted (C12-C20)hydrophobic aliphatic        group; and    -   x is 5-50; and

(ii) a protein.

In some embodiments, a composition comprises:

(i) a polymer of Formula II:

-   -   or a salt thereof, wherein:    -   R is an optionally substituted (C12-C20)hydrophobic aliphatic        group; and    -   x is 5-50; and

(ii) a protein.

In some embodiments, a composition comprises:

(i) a polymer of Formula II:

-   -   wherein:    -   R is an optionally substituted (C12-C20)hydrophobic aliphatic        group; and    -   x is 5-50; and

(ii) a protein.

In some such embodiments, R is CH₃—(CH₂)_(y)— and y is 11-19.

In some such embodiments, R is CH₃(CH₂)₇CH═CH(CH₂)₇CH₂—.

In some embodiments, the composition comprises:

(i) a polymer of Formula III:

-   -   or a salt thereof, wherein:    -   R^(1a) is an optionally substituted (C6-C20)hydrophobic        aliphatic group;    -   R^(1b) is an optionally substituted (C6-C20)hydrophobic        aliphatic group; and    -   x is 5-50; and

(ii) a protein.

In some embodiments, the composition comprises:

(i) a polymer of Formula III:

-   -   wherein:    -   R^(1a) is an optionally substituted (C6-C12)hydrophobic        aliphatic group;    -   R^(1b) is an optionally substituted (C6-C12)hydrophobic        aliphatic group; and    -   x is 5-50; and

(ii) a protein.

In some such embodiments, the polymer is of Formula III, wherein:

-   -   R^(1a) is CH₃—(CH₂)_(y)—;    -   R^(1b) is CH₃—(CH₂)_(z)—;    -   y is 5-19; and    -   z is 5-19.

In some such embodiments, the polymer is of Formula III, wherein:

-   -   R^(1a) is CH₃—(CH₂)_(y)—;    -   R^(1b) is CH₃—(CH₂)_(z)—;    -   y is 5-11; and    -   z is 5-11.

In some embodiments, a composition comprises:

(i) a polymer of Formula IV:

-   -   or a salt thereof, wherein:    -   R^(1a) is an optionally substituted (C1-C6)aliphatic group;    -   R^(1b) is H, or an optionally substituted (C1-C6)aliphatic        group;    -   R² is an optionally substituted (C11-19)hydrophobic aliphatic        group; and    -   x is 5-50; and

(ii) a protein.

In some embodiments, a composition comprises:

(i) a polymer of Formula IV:

-   -   wherein:    -   R^(1a) is an optionally substituted (C1-C6)aliphatic group;    -   R^(1b) is H, or an optionally substituted (C1-C6)aliphatic        group;    -   R² is an optionally substituted (C11-19)hydrophobic aliphatic        group; and    -   x is 5-50; and

(ii) a protein.

In some such embodiments, R² is —(CH₂)_(y)—CH₃, and y is 10-18.

In some such embodiments, R² is R² is —(CH₂)₇CH═CH(CH₂)₇CH₃.

In some embodiments, a composition is any of those described above andherein, further comprising one or more of: water, a preservative, and apH adjuster.

In some embodiments, a composition is any of those described above andherein, wherein the protein is a biologic. Exemplary such proteins aredescribed above and herein and are known to those of skill in thebiological arts.

In some embodiments, a composition comprises:

(i) a polymer selected from Formula (V-a) or (V-b):

or a salt thereof, wherein x is 2-250; and

(ii) a protein.

In some embodiments, a composition comprises:

(i) a polymer of the following structure:

or a salt thereof, wherein x is 2-250; and

(ii) a protein.

In some embodiments, a composition comprises:

(i) a polymer of the following:

wherein x is 5-90; and

(ii) a protein.

In some such embodiments, x is between 5-80, 5-75, 5-70, 5-65, 5-60,5-55, 5-50, 5-45, 5-40, 5-35, 5-30, 5-25, 5-20, 5-15, and 5-10. In somesuch embodiments, x is between 10-90, 10-85, 10-80, 10-75, 10-70, 10-65,10-60, 10-55, 10-50, 10-45, 10-40, 10-35, 10-30, 10-25, 10-20, and10-15. In some such embodiments, x is between 20-90, 20-75, 20-60,20-50, 20-35, 25-90, 25-75, 25-50, 30-90, 30-60, 35-90, 35-80, 35-70,35-60, 35-50, 40-90, 45-70, 50-90, and 50-75.

In some such embodiments, x is greater than 10. In some suchembodiments, x is greater than 20. In some such embodiments, x isgreater than 30. In some such embodiments, x is greater than 40. In somesuch embodiments, x is greater than 50. In some such embodiments, x isgreater than 60. In some such embodiments, x is greater than 70. In somesuch embodiments, x is greater than 80. In some such embodiments, x isgreater than 90. In some such embodiments, x is greater than 100. Insome such embodiments, x is less than 100. In some such embodiments, xis less than 90. In some such embodiments, x is less than 80. In somesuch embodiments, x is less than 70. In some such embodiments, x is lessthan 60. In some such embodiments, x is less than 50. In some suchembodiments, x is less than 40. In some such embodiments, x is less than30. In some such embodiments, x is less than 20. In some suchembodiments, x is less than 10.

In some such embodiments, x is 5. In some such embodiments, x is 10. Insome such embodiments, x is 15. In some such embodiments, x is 20. Insome such embodiments, x is 25. In some such embodiments, x is 30. Insome such embodiments, x is 35. In some such embodiments, x is 40. Insome such embodiments, x is 45. In some such embodiments, x is 50. Insome such embodiments, x is 55. In some such embodiments, x is 60. Insome such embodiments, x is 65. In some such embodiments, x is 70. Insome such embodiments, x is 75. In some such embodiments, x is 80. Insome such embodiments, x is 85. In some such embodiments, x is 90.

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition comprises a polymer of the followingstructure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of the following structure:

In some embodiments, a composition is any of those described above andherein, wherein the polymer is of Formula I, wherein R^(1a) is anoptionally substituted C₁₂ aliphatic group, R^(1b) is H or an optionallysubstituted C₁₂ aliphatic group, R² is H, and x is 23. In someembodiments, a composition is any of those described above and herein,wherein the polymer is of Formula I, wherein R^(1a) is a C₁₂ aliphaticgroup, R^(1b) is H, R² is H, and x is 23. In some embodiments, acomposition is any of those described above and herein, wherein thepolymer is of Formula I, wherein R^(1a) is —(CH₂)₁₁CH₃, R^(1b) is H, R²is H, and x is 23.

In certain embodiments, the present disclosure provides compositionscomprising a protein and a polymer of Formula I, Formula II, FormulaIII, Formula IV, Formula (V-a), or Formula (V-b), in which the proteinis pharmaceutically active (i.e., a biologic protein). Such compositionsmay further comprise one or more excipients, as defined herein. Incertain embodiments, the present disclosure provides compositionscomprising a protein and a polymer of Formula I, Formula II, FormulaIII, or Formula IV in which the protein is pharmaceutically active(i.e., a biologic protein). Such compositions may further comprise oneor more excipients, as defined herein.

In certain embodiments, compositions of the present disclosure may beprovided as drug products useful for the treatment of a patient in needthereof. Compositions of the disclosure may provide a therapeuticallyeffective amount of a protein biologic suitable for the treatment of asubject in need thereof. In some embodiments, the subject is a human.

In certain embodiments, the disclosure provides compositions comprisingone or more proteins and a polymer of Formula I, Formula II, FormulaIII, Formula IV, Formula (V-a), or Formula (V-b), wherein the weightratio of protein to polymer is between about 0.01:1 to about 500:1. Incertain embodiments, the disclosure provides compositions comprising oneor more proteins and a polymer of Formula I, Formula II, Formula III, orFormula IV wherein the weight ratio of protein to polymer is betweenabout 0.01:1 to about 500:1. In some embodiments of the disclosure, theweight ratio of protein to polymer is between about 10:1 to about 250:1.In some embodiments, the weight ratio of protein to polymer is about1:0.1 to about 1:1. In some embodiments, the weight ratio of protein topolymer is about 1:0.1, about 1:0.2, about 1:0.3, about 1:0.4, about1:0.5, about 1:0.6, about 1:0.7, about 1:0.8, about 1:0.9, about 1:1,about 1.1:1, about 1.2:1, about 1.3:1, about 1.4:1, or about 1.5:1. Insome embodiments, the weight ratio of protein to polymer is about 1.5:1,about 2:1, about 2.5:1, about 3:1, about 3.5:1, about 4:1, about 4.5:1,about 5:1, about 5.5:1, about 6:1, about 6.5:1, about 7:1, about 7.5:1,about 8:1, about 8.5:1, about 9:1, about 9.5:1, or about 10:1.

Certain embodiments of the disclosure are provided as pharmaceuticallyacceptable compositions. Such compositions include, but are not limitedto, pills, tablets, capsules, suppositories, creams, aerosols, syrups,film, skin patch, dermal patch, vaginal ring, eye drop. In someembodiments the pharmaceutically acceptable composition is a lyophilizedpowder. In some embodiments, the pharmaceutically acceptable compositionis an aqueous solution or suspension.

Certain embodiments of the disclosure are provided as pharmaceuticallyacceptable compositions packaged in a prefilled syringe, auto-injector,pen injector, or needle free system.

The disclosure also provides compositions that are administered to apatient in need thereof. Routes of administration include, but are notlimited to, parenterally, orally, sublingually, buccally, rectally,vaginally, by the ocular route, by the otic route, nasally, inhalation,nebulization, cutaneously, topically, systemically, or transdermally. Insome embodiments, the compositions of the disclosure are formulated aspart of an implant or device, or formulated for slow or extendedrelease. In some embodiments, the route of administration isintravenous. In some embodiments the route of administration is via acentral venous catheter. In some embodiments the route of administrationis via a peripheral venous catheter. In some embodiments the route ofadministration is subcutaneous.

In certain embodiments of the disclosure, the compositions areformulated for oral administration, e.g., in the form of capsules,cachets, pills, tablets, lozenges (using a flavored basis, usuallysucrose and acacia or tragacanth), powders, granules, or as a solutionor a suspension in an aqueous or non-aqueous liquid, or as anoil-in-water or water-in-oil liquid emulsion, or as an elixir or syrup,or as pastilles (using an inert base, such as gelatin and glycerin, orsucrose and acacia) and the like.

In some embodiments, in solid dosage forms for oral administration(capsules, tablets, pills, dragees, powders, granules, and the like),the compositions of the disclosure are mixed with one or morepharmaceutically acceptable carriers, such as sodium citrate ordicalcium phosphate, and/or any of the following: (1) fillers orextenders, such as starches, lactose, sucrose, glucose, mannitol, and/orsilicic acid; (2) binders, such as, for example, carboxymethylcellulose,alginates, gelatin, polyvinyl pyrrolidone, sucrose, and/or acacia; (3)humectants, such as glycerol; (4) disintegrating agents, such asagar-agar, calcium carbonate, potato or tapioca starch, alginic acid,certain silicates, and sodium carbonate; (5) solution retarding agents,such as paraffin; (6) absorption accelerators, such as quaternaryammonium compounds; (7) wetting agents, such as, for example, cetylalcohol and glycerol monostearate; (8) absorbents, such as kaolin andbentonite clay; (9) lubricants, such a talc, calcium stearate, magnesiumstearate, solid polyethylene glycols, sodium lauryl sulfate, andmixtures thereof; and (10) coloring agents. In some embodiments, thesolid dosage form is a capsules, tablets, or pills, wherein thepharmaceutical compositions comprises one or more buffering agents.Solid compositions of a similar type may also be employed as fillers insoft and hard-filled gelatin capsules using such excipients as lactoseor milk sugars, as well as polyethylene glycols and the like.

In some embodiments, drug products of this disclosure are formulated asliquid dosage forms for oral administration. Liquid dosage forms fororal administration include, but are not limited to, pharmaceuticallyacceptable emulsions, microemulsions, solutions, suspensions, syrups andelixers. In some embodiments, a liquid dosage form comprises inertdiluents commonly used in the art such as water or other solvents,solubilizing agents and emulsifiers, such as ethanol, isopropyl alcohol,ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate,propylene glycol, 1,3-butyline glycol, oils (e.g., cottonseed,groundnut, corn, germ, olive, castor and sesame oils), glycerol,tetrahydrofuryl alcohol, polyethylene glycols and fatty acid esters orsorbitan, and mixtures thereof. In some embodiments, oral compositionscomprise adjuvants such as wetting agents, emulsifying and suspendingagents, sweetening, flavoring, coloring, perfuming and preservativeagents.

In certain embodiments, compositions of the disclosure are formulatedfor parenteral administration. For instance, in some embodiments,compositions of the disclosure are formulated for parenteraladministration by including one or more pharmaceutically acceptablesterile isotonic aqueous or non-aqueous solutions, dispersions,suspensions or emulsions, or sterile powders which, in some embodiments,are reconstituted into sterile injectable solutions or dispersions justprior to use. In some embodiments, compositions for parenteraladministration contain antioxidants, buffers, bacteriostats, and/orsolutes which render the formulation isotonic with the blood of theintended recipient or suspending or thickening agents. Examples ofsuitable aqueous and non-aqueous vehicles for use in the pharmaceuticalcompositions of the disclosure include water, Ringer's solution, anisotonic salt solution, ethanol, polyols (such as 1,3-butanediol,glycerol, propylene glycol, polyethylene glycol, and the like), andsuitable mixtures thereof, vegetable oils, such as olive oil, andinjectable organic esters, such as ethyl oleate. In some embodiments,compositions of the disclosure are intended for parenteraladministration, and comprise a vehicle selected from water,1,3-butanediol, Ringer's solution or an isotonic sodium chloridesolution.

In some embodiments, compositions of the disclosure are formulated forslow, controlled, and/or extended release. The term “extended release”is widely recognized in the art of pharmaceutical sciences and is usedherein to refer to controlled release of an active compound or agentfrom a dosage form to an environment over (throughout or during) anextended period of time, e.g., greater than or equal to one hour. Insome embodiments, an extended-release dosage form will release drug at asubstantially constant rate over an extended period of time or asubstantially constant amount of drug will be released incrementallyover an extended period of time. The term “extended release” used hereinincludes the terms “controlled release,” “prolonged release,” “sustainedrelease,” “delayed release,” or “slow release” as these terms are usedin the pharmaceutical sciences. In some embodiments, theextended-release dosage is administered in the form of a patch or apump.

3.4 Specific Examples

The present disclosure further envisions polymers of the followingstructures:

The present disclosure envisions compositions comprising a protein and apolymer selected from Formula IX to Formula XXXIV.

EXAMPLES

In order for the disclosure to be more fully understood, the followingexamples are set forth. It will be understood that these examples arefor illustrative purposes only and are not to be construed as limitingthis disclosure in any manner.

The following abbreviations are used: bovine serum albumin (BSA);immunoglobin G (IgG), sourced from bovine unless otherwise stated;Fourier-transform infrared spectroscopy (FT-IR); attenuated totalreflectance (ATR); nuclear magnetic resonance (NMR); gel permeationchromatography (GPC); dynamic light scattering (DLS); revolutions perminute (RPM); UV-Vis (ultraviolet-visible); high-performance liquidchromatography (HPLC); N,N-dimethylformamide (DMF);N,N-dimethylacetamide (DMAc); methyl tert-butyl ether (MTBE); dimethylsulfoxide (DMSO); polyethersulfone (PES); polydispersity index (PDI);sarcosine N-carboxyanhydride (Sar NCA); polysorbate 20 (PS20);polysorbate 80 (PS80); poloxamer 188 (PO188); phosphate buffered saline(PBS); polyethylene glycol (PEG).

In the Examples, unless otherwise stated, short-hand names for certaincompositions are used. For example, “Octadecyl-NH-poly(Sar₁₅)” and“Octadecyl-Sar15” are short-hand for octadecyl hydrocarbon chaincovalently attached via an amide bond to a poly(sarcosine) chain with 15repeating units terminating in a hydrogen, as depicted in the followingstructure:

In another example, “Dihexyl-N-poly(Sar₁₅)” and “Dihexyl-Sar15” areshort-hand for two hexyl hydrocarbon chains covalently attached via anamide bond to a poly(sarcosine) chain with 15 repeating unitsterminating in a hydrogen, as depicted in the following structure:

In another example, “N-Butyl-NH-poly(Sar₃₀)-Lauroyl” and“Butyl-Sar30-Lauroyl” are short-hand for an N-butyl hydrocarbon chaincovalently attached via an amide bond to a poly(sarcosine) chain with 30repeating units terminating in an amide bond to a saturated hydrocarbonwith lauroyl hydrocarbon chain, as depicted in the following structure:

1. Analytical Methods

The following analytical methods were used to characterize the compoundsof the present disclosure.

(IR) Spectroscopy—All samples were analyzed using a PerkinElmer Spectrum100 FT-IR Spectrometer equipped with Universal ATR Sampling Accessory(Diamond/ZnSe). When using IR to monitor a reaction, an aliquot ofapproximately 100 μL was taken and measured directly. Solid samples weremeasured without further manipulation.

NMR Spectroscopy—All samples were analyzed in a 400 MHz spectrometerwith the following parameters: 45° pulse, 2 second acquisition time, 5second recycle delay, with 16-32 transients.

GPC Analysis—Samples were analyzed using a Shimadzu LC-20AD pumpconnected in series to: 2×PSS GRAM analytical 100 Å, 8×300 mm, 10 μmcolumns; 1×PSS GRAM analytical 1000 Å, 8×300 mm, 10 μm column; a WyattTREOS II Light Scattering Detector, and a Wyatt Optilab T-rEX refractiveindex detector. A mobile phase of DMF supplemented with LiBr (50 mM) ata flow rate of 1.0 mL was used to elute the analytes. The temperature ofthe columns was maintained at 45° C. Typically, run times of 45 minuteswere employed.

HPLC Analysis—Samples were analyzed using a Shimadzu LC-20AT pumpconnected to a Shimadzu SPD-20A UV-Vis detector. The column used was aWaters Ultrahydrogel DP 120 Å, 6 μm, 7.8 mm×300 mm. A mobile phase of80:20 (v/v) methanol: water supplemented with 0.1% (v/v) trifluoroaceticacid at a flow rate of 1.0 mL was used to elute the analytes. Sampleswere prepared at 1 mg/mL in the mobile phase and the wavelength of thedetector was set to 220 nm and 225 nm. Typically, run times of 15minutes were employed.

General Procedure for Shake Stability Assay—The following is a generalprocedure for this assay and modifications to protein, concentrations,amounts, times, and temperatures are noted when applicable. Stocksolutions of a protein (e.g., IgG or BSA) at 40 mg/mL, and each polymerexcipient at 2 mg/mL were prepared in phosphate buffer (25 mM sodiumphosphate buffer, 150 mM NaCl, pH 5.0) and then filtered through asyringe-driven 0.22 μm PES filter. For each stability assay, anapplicable amount of protein, polymer excipient, and phosphate bufferwere combined to a final volume of 1.5 mL unless otherwise noted. Forexample, 750 μL of 40 mg/mL protein stock, 75 μL of 2 mg/mL polymerexcipient stock, and 675 μL of phosphate buffer were combined for assayswith a protein concentration of 20 mg/mL and polymer excipientconcentration of 0.1 mg/mL. Stability assays solutions were prepared ina 2 mL clear serum vial (USP Type 1 borosilicate glass, 15×32 mm, 13 mmcrimp) and capped with a stopper (bromobutyl rubber stopper, 13 mm). Thevials were placed in an orbital shaker set to 37° C. and 120 RPM. Ateach time point a 150 μL aliquot was transferred to a 96-well plate(Greiner Bio-One, Sensoplate microplate, glass bottom, black). Data wascollected on a Dynamic Light Scattering (DLS) instrument (WyattTechnology, DynaPro Plate Reader III) with the following parameters: 1second acquisition time, 5 acquisitions, 25° C. Data were processed withDYNAMICS (Wyatt Technology, v8.0).

General Procedure for Temperature Ramp Study—The following is a generalprocedure for this assay and modifications to protein, concentrations,amounts, times, and temperatures are noted when applicable. Stocksolutions of protein (e.g., IgG or BSA) at 2 mg/mL, and each polymerexcipient at 2 mg/mL were prepared in phosphate buffer (25 mM sodiumphosphate buffer, 150 mM NaCl, pH 7.0) and then filtered through asyringe-driven 0.22 μm PES filter. For each temperature ramp assay, anapplicable amount of protein, polymer excipient, and phosphate bufferwere combined in a scintillation vial to a final volume of 0.8 mL unlessotherwise noted. For example, 400 μL of 2 mg/mL protein stock, 400 μL of2 mg/mL polymer excipient stock, were combined for assays with a proteinconcentration of 1 mg/mL and polymer excipient concentration of 1 mg/mL.An aliquot (35 μL) of each sample was transferred to a 384-well plate(Aurora, round 384 IQ-LV, black cycloolefin polymer, 188 micron clearfilm bottom, ultra flat) and then sealed with clear sealing tape. Datawas collected on a DLS instrument (Wyatt Technology, DynaPro PlateReader III) with the following parameters: 1 second acquisition time, 5acquisitions, temperature ramp from 25° C. to 80° C. at a rate of 0.05°C./minute. Data was processed with DYNAMICS (Wyatt Technology, v8.0).

General Procedure for Temperature Hold Study—The following is a generalprocedure for this assay and modifications to protein, concentrations,amounts, times, and temperatures are noted when applicable. Stocksolutions of protein (e.g., IgG or BSA) at 40 mg/mL, and each polymerexcipient at 2 mg/mL were prepared in phosphate buffer (25 mM sodiumphosphate buffer, 150 mM NaCl, pH 7.0) and then filtered through asyringe-driven 0.22 μm PES filter. For each temperature hold assay, anapplicable amount of protein, polymer excipient, and phosphate bufferwere combined in a scintillation vial to a final volume of 0.8 mL unlessotherwise noted. For example, 400 μL of 40 mg/mL protein stock, 400 μLof 2 mg/mL polymer excipient stock, were combined for assays with aprotein concentration of 20 mg/mL and polymer excipient concentration of1 mg/mL. An aliquot (35 μL) of each sample was transferred to a 384-wellplate (Aurora, round 384 IQ-LV, black cycloolefin polymer, 188 micronclear film bottom, ultra flat) and then sealed with clear sealing tape.Data was collected on a DLS instrument (Wyatt Technology, DynaPro PlateReader III) with the following parameters: 1 second acquisition time, 5acquisitions, temperature held at 50° C. for 92 hours. Data wasprocessed with DYNAMICS (Wyatt Technology, v8.0).

General Procedure for Lyophilization Study—The following is a generalprocedure for this assay and modifications to protein, concentrations,amounts, times, and temperatures are noted when applicable. Stocksolutions of protein (e.g., IgG, abatacept, cetuximab, etc.) at 0.5mg/mL, and each polymer excipient at a range of 0.1 to 2.0 mg/mL wereprepared in phosphate buffer (25 mM sodium phosphate buffer, pH 7.0).For each lyophilization study, an applicable amount of protein, polymerexcipient, and phosphate buffer were combined in an Eppendorf tube to afinal volume of 1.0 mL unless otherwise noted. For example, 100 μL of 5mg/mL protein stock, 250 μL of 2 mg/mL polymer excipient stock and 650μL phosphate buffer, were combined for assays with a proteinconcentration of 0.5 mg/mL and polymer excipient concentration of 0.5mg/mL. Each aliquot was then filtered through a syringe-driven 0.22 μmPES filter. An aliquot (35 μL) of each sample was transferred to a384-well plate (Aurora, round 384 IQ-LV, black cycloolefin polymer, 188micron clear film bottom, ultra flat). Data was collected on a DLSinstrument (Wyatt Technology, DynaPro Plate Reader III) with thefollowing parameters: 1 second acquisition time, 5 acquisitions,temperature held at 25° C. Data was processed with DYNAMICS (WyattTechnology, v8.0). For each solution, 0.2 mL was then placed in a 2 mLserum vial and lyophilized (Frozen for 2 hours at ˜30° C.; vacuum at180-250 mTorr; primary drying at 25° C. for 4 hours; secondary drying at40° C. for 36 hours). The lyophile was reconstituted with 0.2 mL offiltered deionized water. An aliquot (35 μL) of each sample wastransferred to a 384-well plate and the particle size afterlyophilization measured as described previously in this paragraph. Animage of each well is captured by the DYNAMICS software.

2. Polymer Synthesis Examples

Example 1—Preparation of Neopentyl-NH-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with neopentylamine (90 mg, 1.032mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (10 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 15° C.The solution was stirred and allowed to equilibrate for ˜10 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.78 g, 15.5mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at -1850 and1778 cm¹. After stirring overnight, the reaction mixture was transferredto a beaker using DMAc (2 mL) to rinse the reaction flask. Whilestirring vigorously with an overhead stirrer, methyl tert-butyl ether(MTBE) (120 mL, ˜10 volumes) was added slowly over 10-15 seconds. Theprecipitation was stirred for 1-2 mins before the stirring was stoppedand the material was allowed to settle before collected via vacuumfiltration in a medium porosity fritted glass funnel. The semi-drymaterial was slurried briefly on the frit with an additional MTBE (60mL, 5 volumes). The product was dried in vacuum oven at −50° C. for 2days to yield 1.07 g (89.9%) of the title compound as a white densepowder. GPC (DMF, 50 mM LiBr) Mn=1,129 Da, Mp=1,158 Da, PDI=1.02; Purity(HPLC)=92.4%.

Example 2—Preparation of Neopentyl-NH-poly(Sar₃₀)

Following the general procedure of Example 1 with the following reagentequivalents and amounts: neopentylamine (45 mg, 1 equiv.), sarcosine NCA(1.78 g, 30 equiv.), DMAc (10 mL). This yielded the title compound as adense white solid (1.09 g, 95.1%). GPC (DMF, 50 mM LiBr) Mn=1,972 Da,Mp=2,038 Da, PDI=1.02; Purity (HPLC)=95.3%.

Example 3—Preparation of Neopentyl-NH-poly(Sar₆₀)

Following the general procedure of Example 1 with the following reagentequivalents and amounts: neopentylamine (40 mg, 1 equiv.), sarcosine NCA(3.17 g, 60 equiv.), DMAc (12 mL). This yielded the title compound as adense white solid (1.89 g, 94.6%). GPC (DMF, 50 mM LiBr) Mn=3,627 Da,Mp=3,668 Da, PDI=1.01; Purity (HPLC)=92.6%.

Example 4—Preparation of Neopentyl-NH-poly(Sar₁₂₀)

Following the general procedure of Example 1 with the following reagentequivalents and amounts: neopentylamine (20 mg, 1 equiv.), sarcosine NCA(3.17 g, 120 equiv.), DMAc (12 mL). This yielded the title compound as adense white solid (1.84 g, 93.1%). GPC (DMF, 50 mM LiBr) Mn=5,847 Da,Mp=6,017 Da, PDI=1.02; Purity (HPLC)=96.8%.

Example 5—Preparation of Neopentyl-NH-poly(Sar₁₇₅)

Following the general procedure of Example 1 with the following reagentequivalents and amounts: neopentylamine (4 mg, 1 equiv.), sarcosine NCA(924 mg, 175 equiv.), DMAc (2 mL). GPC (DMF, 50 mM LiBr) Mn=6,546 Da,Mp=7,104 Da, PDI=1.04.

Example 6—Preparation of Neopentyl-NH-poly(Sar₂₄₀)

Following the general procedure of Example 1 with the following reagentequivalents and amounts: neopentylamine (10 mg, 1 equiv.), sarcosine NCA(3.17 g, 240 equiv.), DMAc (12 mL). This yielded the title compound as adense off-white solid (0.680 g, 34.6%). GPC (DMF, 50 mM LiBr) Mn=7,842Da, Mp=8,481 Da, PDI=1.06; Purity (HPLC)=91.1%.

Example 7—Preparation of Neopentyl-NH-poly(Sar₄₈₀)

Following the general procedure of Example 1 with the following reagentequivalents and amounts: neopentylamine (5 mg, 1 equiv.), sarcosine NCA(3.17 g, 480 equiv.), DMAc (12 mL). This yielded the title compound as adense off-white solid (1.90 g, 96.8%). GPC (DMF, 50 mM LiBr) Mn=8,036Da, Mp=9,742 Da, PDI=1.11; Purity (HPLC)=94.4%.

Example 8—Preparation of 4-Methoxybenzyl-NH-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with 4-methoxybenzylamine (140mg, 1.02 mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (12 mL). Thereaction flask was then placed in a jacketed reaction beaker equipped toa circulating isopropanol/water bath with the temperature set to 15° C.The solution was stirred and allowed to equilibrate for ˜10 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.76 g, 15.3mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring overnight, the reaction mixture was transferredto a beaker using DMAc (5 mL) to rinse the reaction flask. Whilestirring vigorously with an overhead stirrer, methyl tert-butyl ether(MTBE) (120 mL, ˜7 volumes) was added slowly over 10-15 seconds. Theprecipitation was stirred for 1-2 mins before the stirring was stoppedand the material was allowed to settle before collected via vacuumfiltration in a medium porosity fritted glass funnel. The semi-drymaterial was slurried briefly on the frit with an additional MTBE (50mL). The product was dried in vacuum oven at −50° C. for 2 days to yield1.21 g (98.6%) of the title compound as a dense white powder. GPC (DMF,50 mM LiBr) Mn=1,261 Da, Mp=1,341 Da, PDI=1.02; Purity (HPLC)=94.7%.

Example 9—Preparation of 4-Methoxybenzyl-NH-poly(Sar₃₀)

Following the general procedure of Example 8 with the following reagentequivalents and amounts: 4-methoxybenzylamine (70 mg, 1 equiv.),sarcosine NCA (1.76 g, 30 equiv.), DMAc (12 mL). This yielded the titlecompound as a dense white solid (1.03 g, 89.0%). GPC (DMF, 50 mM LiBr)Mn=2,212 Da, Mp=2,278 Da, PDI=1.01; Purity (HPLC)=97.4%.

Example 10—Preparation of Octyl-NH-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with octylamine (130 mg, 1.01mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (12 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 15° C.The solution was stirred and allowed to equilibrate for ˜10 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.74 g, 15.2mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring overnight, the reaction mixture was transferredto a beaker using DMAc (5 mL) to rinse the reaction flask. Whilestirring vigorously with an overhead stirrer, methyl tert-butyl ether(MTBE) (120 mL, ˜7 volumes) was added slowly over 15-20 seconds. Theprecipitation was stirred for 1-2 mins before the stirring was stoppedand the material was allowed to settle before collected via vacuumfiltration in a medium porosity fritted glass funnel. The semi-drymaterial was slurried briefly on the frit with an additional MTBE (50mL). The material was dried in vacuum oven at −50° C. for 2 days. Thisyielded 993 mg (82.8%) of the title compound as a dense white powder.GPC (DMF, 50 mM LiBr) Mn=1,048 Da, Mp=1,149 Da, PDI=1.03; Purity(HPLC)=98.2%.

Example 11—Preparation of Octyl-NH-poly(Sar₃₀)

Following the general procedure of Example 10 with the following reagentequivalents and amounts: octylamine (65 mg, 1 equiv.), sarcosine NCA(1.74 g, 30 equiv.), DMAc (12 mL). This yielded the title compound as adense white solid (1.02 g, 89.5%). GPC (DMF, 50 mM LiBr) Mn=1,995 Da,Mp=2,041 Da, PDI=1.01; Purity (HPLC)=97.5%.

Example 12—Preparation of Decyl-NH-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with decylamine (154 mg, 0.979mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (12 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 15° C.The solution was stirred and allowed to equilibrate for ˜10 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.69 g, 14.7mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring overnight, the reaction mixture was transferredto a beaker using DMAc (2×2.5 mL) to rinse the reaction flask. Whilestirring vigorously with an overhead stirrer, methyl tert-butyl ether(MTBE) (120 mL, ˜7 volumes) was added slowly over 15-20 seconds. Theprecipitation was stirred for 1-2 mins before the stirring was stoppedand the material was allowed to settle before collected via vacuumfiltration in a medium porosity fritted glass funnel. The semi-drymaterial was slurried briefly on the frit with an additional MTBE (50mL). The material was dried in vacuum oven at −50° C. for 2 days. Thisyielded 145 mg (12.1%) of the title compound as a dense white powder.GPC (DMF, 50 mM LiBr) Mn=1,148 Da, Mp=1,181 Da, PDI=1.01; Purity(HPLC)=98.5%.

Example 13—Preparation of Decyl-NH-poly(Sar₃₀)

Following the general procedure of Example 12 with the following reagentequivalents and amounts: decylamine (77 mg, 1 equiv.), sarcosine NCA(1.69 g, 30 equiv.), DMAc (12 mL). This yielded the title compound as adense white solid (800 mg, 71.4%). GPC (DMF, 50 mM LiBr) Mn=1,895 Da,Mp=1,922 Da, PDI=1.01; Purity (HPLC)=97.6%.

Example 14—Preparation of Dodecyl-NH-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with dodecylamine (180 mg, 0.971mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (12 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 25° C.The solution was stirred and allowed to equilibrate for ˜10 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.68 g, 14.6mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm⁻¹. After stirring overnight, the reaction mixture wastransferred to a beaker using DMAc (2×2.5 mL) to rinse the reactionflask. While stirring vigorously with an overhead stirrer, methyltert-butyl ether (MTBE) (120 mL, ˜7 volumes) was added slowly over 15-20seconds. The precipitation was stirred for 1-2 mins before the stirringwas stopped and the material was allowed to settle before collected viavacuum filtration in a medium porosity fritted glass funnel. Thesemi-dry material was slurried briefly on the frit with an additionalMTBE (50 mL). The material was dried in vacuum oven at −50° C. for 2days. This yielded 1.15 g (94.5%) of the title compound as a dense whitepowder. GPC (DMF, 50 mM LiBr) Mn=1,178 Da, Mp=1,251 Da, PDI=1.02; Purity(HPLC)=98.9%.

Example 15—Preparation of Dodecyl-NH-poly(Sar₂₀)

Following the general procedure of Example 14 with the following reagentequivalents and amounts: dodecylamine (180 mg, 1 equiv.), sarcosine NCA(2.24 g, 20 equiv.), DMAc (15 mL). This yielded the title compound as adense white solid (1.34 g, 85.8%). GPC (DMF, 50 mM LiBr) Mn=1,358 Da,Mp=1,411 Da, PDI=1.01; Purity (HPLC)=98.2%.

Example 16—Preparation of Dodecyl-NH-poly(Sar₃₀)

Following the general procedure of Example 14 with the following reagentequivalents and amounts: dodecylamine (90 mg, 1 equiv.), sarcosine NCA(1.68 g, 30 equiv.), DMAc (12 mL). This yielded the title compound as adense white solid (1.02 g, 90.7%). GPC (DMF, 50 mM LiBr) Mn=2,077 Da,Mp=2,132 Da, PDI=1.01; Purity (HPLC)=97.8%.

Example 17—Preparation of Tetradecyl-NH-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with tetradecylamine (210 mg,0.984 mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (12 mL). Thereaction flask was then placed in a jacketed reaction beaker equipped toa circulating isopropanol/water bath with the temperature set to 25° C.The solution was stirred and allowed to equilibrate for ˜10 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.70 g, 14.8mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring overnight, the reaction mixture was transferredto a beaker using DMAc (2×2.5 mL) to rinse the reaction flask. Whilestirring vigorously with an overhead stirrer, methyl tert-butyl ether(MTBE) (120 mL, ˜7 volumes) was added slowly over 15-20 seconds. Theprecipitation was stirred for 1-2 mins before the stirring was stoppedand the material was allowed to settle before collected via vacuumfiltration in a medium porosity fritted glass funnel. The semi-drymaterial was slurried briefly on the frit with an additional MTBE (50mL). The material was dried in vacuum oven at −50° C. for 2 days. Thisyielded 1.07 g (85.0%) of the title compound as a dense white powder.GPC (DMF, 50 mM LiBr) Mn=1,187 Da, Mp=1,225 Da, PDI=1.01; Purity(HPLC)=98.5%.

Example 18—Preparation of Tetradecyl-NH-poly(Sar₂₀)

Following the general procedure of Example 17 with the following reagentequivalents and amounts: tetradecylamine (250 mg, 1 equiv.), sarcosineNCA (2.70 g, 20 equiv.), DMAc (15 mL). This yielded the title compoundas a dense white solid (1.81 g, 94.5%). GPC (DMF, 50 mM LiBr) Mn=1,418Da, Mp=1,475 Da, PDI=1.01; Purity (HPLC)=97.3%.

Example 19—Preparation of Tetradecyl-NH-poly(Sar₃₀)

Following the general procedure of Example 17 with the following reagentequivalents and amounts: tetradecylamine (105 mg, 1 equiv.), sarcosineNCA (1.70 g, 30 equiv.), DMAc (12 mL). This yielded the title compoundas a dense white solid (1.09 g, 94.5%). GPC (DMF, 50 mM LiBr) Mn=1,989Da, Mp=2,025 Da, PDI=1.01; Purity (HPLC)=97.3%.

Example 20—Preparation of Hexadecyl-NH-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with hexadecylamine (320 mg, 1.33mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (64 mL). The mixturewas heated with a heat gun while swirling by hand and then submerged ina sonicating water bath until a clear solution was obtained. Thereaction flask was then placed in a jacketed reaction beaker equipped toa circulating isopropanol/water bath with the temperature set to 25° C.The solution was stirred and allowed to equilibrate for ˜10 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (2.29 g, 19.9mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring overnight, the reaction mixture was transferredto a beaker using DMAc (4 mL) to rinse the reaction flask. Whilestirring vigorously with an overhead stirrer, methyl tert-butyl ether(MTBE) (340 mL, 5 volumes) was added slowly over 15-20 seconds. Theprecipitation was stirred for 3-5 mins before the stirring was stoppedand the material was allowed to settle before collected via vacuumfiltration in a medium porosity fritted glass funnel. The semi-drymaterial was slurried briefly on the frit with an additional MTBE (2×50mL). The material was dried in vacuum oven at ˜50° C. for 2 days. Thecrude product was dissolved in methanol (25 mL) and then precipitated bythe addition of MTBE (100 mL, 4 volumes) while stirring vigorously. Theproduct was collected via vacuum filtration in a medium porosity frittedglass funnel and then dried in a vacuum oven at −50° C. for 2 days. Thisyielded 224 mg (12.9%) of the title compound as a white dense powder.GPC (DMF, 50 mM LiBr) Mn=1,247 Da, Mp=1,322 Da, PDI=1.01; Purity(HPLC)=97.7%.

Example 21—Preparation of Hexadecyl-NH-poly(Sar₃₀)

Following the general procedure of Example 20 with the following reagentequivalents and amounts: hexadecylamine (160 mg, 1 equiv.), sarcosineNCA (2.29 g, 30 equiv.), DMAc (47 mL). This yielded the title compoundas a dense white solid (0.767 g, 48.8%). GPC (DMF, 50 mM LiBr) Mn=2,003Da, Mp=2,080 Da, PDI=1.01; Purity (HPLC) =97.9%.

Example 22—Preparation of Hexadecyl-NH-poly(Sar₆₀)

Following the general procedure of Example 20 with the following reagentequivalents and amounts: hexadecylamine (80 mg, 1 equiv.), sarcosine NCA(2.29 g, 60 equiv.), DMAc (20 mL). This yielded the title compound as adense white solid (1.39 g, 93.1%). GPC (DMF, 50 mM LiBr) Mn=3,470 Da,Mp=3,534 Da, PDI=1.01; Purity (HPLC)=99.8%.

Example 23—Preparation of Hexadecyl-NH-poly(Sar₁₂₀)

Following the general procedure of Example 20 with the following reagentequivalents and amounts: hexadecylamine (40 mg, 1 equiv.), sarcosine NCA(2.29 g, 120 equiv.), DMAc (16 mL). This yielded the title compound as adense white solid (1.35 g, 92.9%). GPC (DMF, 50 mM LiBr) Mn=5,480 Da,Mp=5,572 Da, PDI=1.02; Purity (HPLC)=99.9%.

Example 24—Preparation of Hexadecyl-NH-poly(Sar₂₄₀)

Following the general procedure of Example 20 with the following reagentequivalents and amounts: hexadecylamine (20 mg, 1 equiv.), sarcosine NCA(2.29 g, 240 equiv.), DMAc (16 mL). This yielded the title compound as adense white solid (1.34 g, 93.5%). GPC (DMF, 50 mM LiBr) Mn=7,132 Da,Mp=7,898 Da, PDI=1.07; Purity (HPLC)=99.9%.

Example 25—Preparation of Hexadecyl-NH-poly(Sar₄₈₀)

Following the general procedure of Example 20 with the following reagentequivalents and amounts: hexadecylamine (10 mg, 1 equiv.), sarcosine NCA(2.29 g, 480 equiv.), DMAc (16 mL). This yielded the title compound as adense white solid (1.24 g, 87.1%). GPC (DMF, 50 mM LiBr) Mn=7,922 Da,Mp=9,265 Da, PDI=1.10; Purity (HPLC)=99.9%.

Example 26—Preparation of Octadecyl-NH-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with octadecylamine (270 mg, 1.00mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (10 mL). The mixturewas heated with a heat gun while swirling by hand and then submerged ina sonicating water bath until a clear solution was obtained. Thereaction flask was then placed in a jacketed reaction beaker equipped toa circulating isopropanol/water bath with the temperature set to 30° C.The solution was stirred and allowed to equilibrate for ˜5 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.73 g, 15.0mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring 3 hrs, the reaction mixture was transferred toa beaker using DMAc (4 mL) to rinse the reaction flask. While stirringvigorously with an overhead stirrer, methyl tert-butyl ether (MTBE) (340mL, 5 volumes) was added slowly over 15-20 seconds. The precipitationwas stirred for 3-5 mins before the stirring was stopped and thematerial was allowed to settle before collected via vacuum filtration ina medium porosity fritted glass funnel. The semi-dry material wasslurried briefly on the frit with an additional MTBE (2×50 mL). Thematerial was dried in vacuum oven at −50° C. for 2 days. The crudeproduct was dissolved in methanol (25 mL) and then precipitated by theaddition of MTBE (100 mL, 4 volumes) while stirring vigorously. Theproduct was collected via vacuum filtration in a medium porosity frittedglass funnel and then dried in a vacuum oven at −50° C. for 2 days. Thisyielded 1.08 g (80.8%) of the title compound as a white dense powder.GPC (DMF, 50 mM LiBr) Mn=1,197 Da, Mp=1216 Da, PDI=1.01; Purity(HPLC)=96.7%.

Example 27—Preparation of Octadecyl-NH-poly(Sar₃₀)

Following the general procedure of Example 26 with the following reagentequivalents and amounts: octadecylamine (135 mg, 1 equiv.), sarcosineNCA (1.73 g, 30 equiv.), DMAc (10 mL). This yielded 1.18 g (91.1%) ofthe title compound as a dense white solid. GPC (DMF, 50 mM LiBr)Mn=1,911 Da, Mp=1,905 Da, PDI=1.01; Purity (HPLC)=95.7%.

Example 28—Preparation of Oleyl-NH-poly(Sar₃₀)

A 100 mL round-bottom flask was charged with oleylamine (436 mg, 1.63mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (40 mL). The mixturewas heated with a heat gun while swirling by hand and then submerged ina sonicating water bath until a clear and colorless solution wasobtained. The reaction flask was then placed in a jacketed reactionbeaker equipped to a circulating isopropanol/water bath with thetemperature set to 15° C. The solution was stirred and allowed toequilibrate for ˜10 mins before the addition of sarcosineN-carboxyanhydride (Sar NCA) (5.63 g, 48.9 mmol, 30 equiv.). IRspectroscopy was used to monitor the reaction progression viadisappearance of the carbonyl stretches at ˜1850 and 1778 cm¹. Afterstirring overnight, the reaction mixture was transferred to a beakerusing DMAc (2×2.5 mL) to rinse the reaction flask. While stirringvigorously with an overhead stirrer, methyl tert-butyl ether (MTBE) (225mL, 5 volumes) was added slowly over 30-60 seconds. The precipitationwas stirred for 3-5 mins before the stirring was stopped and thematerial was allowed to settle before collected via vacuum filtration ina medium porosity fritted glass funnel. The semi-dry material wasslurried briefly on the frit with an additional MTBE (50 mL×2, 2 volumestotal). The product was dried in vacuum oven at ˜50° C. for 2 days toyield 3.60 g (92.1%) of the title compound as a white dense powder. GPC(DMF, 50 mM LiBr) Mn=2,034 Da, Mp=2,055 Da, PDI=1.01; Purity(HPLC)=97.7%.

Example 29—Preparation of Oleyl-NH-poly(Sar₁₀)

Following the general procedure of Example 28 with the following reagentequivalents and amounts: oleylamine (300 mg, 1 equiv.), sarcosine NCA(1.29 g, 10 equiv.). This yielded the title compound as a dense whitesolid (0.703 g, 64.1%). GPC (DMF, 50 mM LiBr) Mn=930 Da, Mp=965 Da,PDI=1.01; Purity (HPLC)=93.5%.

Example 30—Preparation of Oleyl-NH-poly(Sar₁₅)

Following the general procedure of Example 28 with the following reagentequivalents and amounts: oleylamine (200 mg, 1 equiv.), sarcosine NCA(1.29 g, 15 equiv.). This yielded the title compound as a dense whitesolid (0.850 g, 85.3%). GPC (DMF, 50 mM LiBr) Mn=1,249 Da, Mp=1,272 Da,PDI=1.01; Purity (HPLC)=98.3%.

Example 31—Preparation of Oleyl-NH-poly(Sar₂₀)

Following the general procedure of Example 28 with the following reagentequivalents and amounts: oleylamine (150 mg, 1 equiv.), sarcosine NCA(1.29 g, 20 equiv.). This yielded the title compound as a dense whitesolid (0.853 g, 90.0%). GPC (DMF, 50 mM LiBr) Mn=1,485 Da, Mp=1,518 Da,PDI=1.01; Purity (HPLC)=98.4%.

Example 32—Preparation of Oleyl-NH-poly(Sar₄₅)

Following the general procedure of Example 28 with the following reagentequivalents and amounts: oleylamine (66.6 mg, 1 equiv.), sarcosine NCA(1.29 g, 45 equiv.). This yielded the title compound as a dense whitesolid (0.850 g, 98.5%). GPC (DMF, 50 mM LiBr) Mn=2,736 Da, Mp=2,766 Da,PDI=1.01; Purity (HPLC)=97.7%.

Example 33—Preparation of Oleyl-NH-poly(Sar₆₀)

Following the general procedure of Example 28 with the following reagentequivalents and amounts: oleylamine (50 mg, 1 equiv.), sarcosine NCA(1.29 g, 60 equiv.). This yielded the title compound as a dense whitesolid (0.817 g, 96.4%). GPC (DMF, 50 mM LiBr) Mn=3,637 Da, Mp=3,682 Da,PDI=1.02; Purity (HPLC)=98.0%.

Example 34—Preparation of Oleyl-NH-poly(Sar₁₂₀)

Following the general procedure of Example 28 with the following reagentequivalents and amounts: oleylamine (25 mg, 1 equiv.), sarcosine NCA(1.29 g, 120 equiv.). This yielded the title compound as a dense whitesolid (0.817 g, 99.4%). GPC (DMF, 50 mM LiBr) Mn=5,389 Da, Mp=5,684 Da,PDI=1.05; Purity (HPLC)=97.%.

Example 35—Preparation of Dihexyl-N-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with dihexylamine (184 mg, 0.993mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (10 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 18° C.The solution was stirred and allowed to equilibrate for ˜5 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.71 g, 14.9mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring overnight, the reaction mixture was transferredto a beaker using DMAc (2×2 mL) to rinse the reaction flask. Whilestirring vigorously with an overhead stirrer, methyl tert-butyl ether(MTBE) (100 mL, ˜7 volumes) was added slowly over 5-10 seconds. Theprecipitation was stirred for 1-2 mins before the stirring was stoppedand the material was allowed to settle before collected via vacuumfiltration in a medium porosity fritted glass funnel. The semi-drymaterial was slurried briefly on the frit with an additional MTBE (35mL). The material was dried in vacuum oven at −50° C. for 2 days. Thisyielded 978 mg (78.8%) of the title compound as a dense white powder.GPC (DMF, 50 mM LiBr) Mn=1,209 Da, Mp=1,234 Da, PDI=1.01; Purity(HPLC)=98.6%.

Example 36—Preparation of Dihexyl-N-poly(Sar₃₀)

Following the general procedure of Example 35 with the following reagentequivalents and amounts: dihexylamine (92 mg, 1 equiv.), sarcosine NCA(1.71 g, 30 equiv.), DMAc (10 mL). This yielded the title compound as adense white solid (890 mg, 77.4%). GPC (DMF, 50 mM LiBr) Mn=1,861 Da,Mp=1,904 Da, PDI=1.01; Purity (HPLC)=96.8%.

Example 37—Preparation of Dioctyl-N-poly(Sar₁₅)

A 25 mL round-bottom flask was charged with dioctylamine (240 mg, 0.994mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (10 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 18° C.The solution was stirred and allowed to equilibrate for ˜5 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.71 g, 14.9mmol, 15 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring overnight, the reaction mixture was transferredto a beaker using DMAc (2×2 mL) to rinse the reaction flask. Whilestirring vigorously with an overhead stirrer, methyl tert-butyl ether(MTBE) (100 mL, ˜7 volumes) was added slowly over 5-10 seconds. Theprecipitation was stirred for 1-2 mins before the stirring was stoppedand the material was allowed to settle before collected via vacuumfiltration in a medium porosity fritted glass funnel. The semi-drymaterial was slurried briefly on the frit with an additional MTBE (35mL). The material was dried in vacuum oven at ˜50° C. for 2 days. Thisyielded 896 mg (69.0%) of the title compound as a dense white powder.GPC (DMF, 50 mM LiBr) Mn=1,242 Da, Mp=1,265 Da, PDI=1.01; Purity(HPLC)=98.0%.

Example 38—Preparation of Dioctyl-N-poly(Sar₃₀)

Following the general procedure of Example 37 with the following reagentequivalents and amounts: dioctylamine (120 mg, 1 equiv.), sarcosine NCA(1.71 g, 30 equiv.), DMAc (10 mL). This yielded the title compound as adense white solid (860 mg, 72.9%). GPC (DMF, 50 mM LiBr) Mn=1,879 Da,Mp=1,939 Da, PDI=1.01; Purity (HPLC)=98.3%.

Example 39—Preparation of Didodecyl-N-poly(Sar₃₀)

A 25 mL round-bottom flask was charged with didodecylamine (150 mg,0.424 mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (10 mL). Thereaction flask was then placed in a jacketed reaction beaker equipped toa circulating isopropanol/water bath with the temperature set to 40° C.The solution was stirred and allowed to equilibrate for ˜5 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.46 g, 12.7mmol, 30 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring for 2 hours, the reaction mixture wastransferred to a beaker using DMAc (2×2 mL) to rinse the reaction flask.While stirring vigorously with an overhead stirrer, methyl tert-butylether (MTBE) (100 mL, ˜7 volumes) was added slowly over 5-10 seconds.The precipitation was stirred for 1-2 mins before the stirring wasstopped and the material was allowed to settle before collected viavacuum filtration in a medium porosity fritted glass funnel. Thesemi-dry material was slurried briefly on the frit with an additionalMTBE (35 mL). The material was dried in vacuum oven at ˜50° C. for 2days. This yielded 1.01 mg (95.8%) of the title compound as a densewhite powder. GPC (DMF, 50 mM LiBr) Mn=2,016 Da, Mp=2,089 Da, PDI=1.01;Purity (HPLC)=95.8%.

Example 40—Preparation of Didodecyl-N-poly(Sar₆₀)

Following the general procedure of Example 39 with the following reagentequivalents and amounts: didodecylamine (55 mg, 1 equiv.), sarcosine NCA(1.07 g, 60 equiv.), DMAc (10 mL). This yielded the title compound as adense white solid (706 mg, 98.3%). GPC (DMF, 50 mM LiBr) Mn=3,273 Da,Mp=3,382 Da, PDI=1.02; Purity (HPLC)=98.1%.

Example 41—Preparation of N-Butyl-NH-poly(Sar₃₀)-Lauroyl

A 25 mL round-bottom flask was charged with N-butylamine (30 mg, 0.410mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (5 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 15° C.The solution was stirred and allowed to equilibrate for ˜5 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.42 g, 12.3mmol, 30 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring for 5 hours, the Sar NCA was completelyconsumed, and the temperature of the reaction was raised to 25° C.Triethylamine (572 μL, 4.10 mmol, 10 equiv.) was added to the reaction,followed by lauroyl chloride (0.949 mL, 4.102 mmol, 10 equiv.). Thereaction was stirred overnight before filtering through a mediumporosity fritted glass funnel and rinsing with DMAc (˜4 mL). Thereaction mixture was transferred to a beaker using DMAc (2×1 mL) torinse the filtration flask. While stirring vigorously with an overheadstirrer, methyl tert-butyl ether (MTBE) (80 mL, ˜7 volumes) was addedslowly over 5-10 seconds. The precipitation was stirred for 1-2 minsbefore the stirring was stopped and the material was allowed to settlebefore collected via vacuum filtration in a medium porosity frittedglass funnel. The semi-dry material was slurried briefly on the fritwith an additional MTBE (25 mL). The material was dried in vacuum ovenat ˜50° C. for 2 days. This yielded 708 mg (72.3%) of the title compoundas a dense powder. GPC (DMF, 50 mM LiBr) Mn=2,009 Da, Mp=1,902 Da,PDI=1.05; Purity (HPLC)=99.1%.

Example 42—Preparation of N-Butyl-NH-poly(Sar₃₀)-Myristoyl

A 25 mL round-bottom flask was charged with N-butylamine (30 mg, 0.410mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (5 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 15° C.The solution was stirred and allowed to equilibrate for ˜5 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.42 g, 12.3mmol, 30 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring for 5 hours, the Sar NCA was completelyconsumed, and the temperature of the reaction was raised to 25° C.Triethylamine (572 μL, 4.10 mmol, 10 equiv.) was added to the reaction,followed by myristoyl chloride (1.115 mL, 4.102 mmol, 10 equiv.). Thereaction was stirred overnight before filtering through a mediumporosity fritted glass funnel and rinsing with DMAc (˜4 mL). Thereaction mixture was transferred to a beaker using DMAc (2×1 mL) torinse the filtration flask. While stirring vigorously with an overheadstirrer, methyl tert-butyl ether (MTBE) (80 mL, ˜7 volumes) was addedslowly over 5-10 seconds. The precipitation was stirred for 1-2 minsbefore the stirring was stopped and the material was allowed to settlebefore collected via vacuum filtration in a medium porosity frittedglass funnel. The semi-dry material was slurried briefly on the fritwith an additional MTBE (25 mL). The material was dried in vacuum ovenat ˜50° C. for 2 days. This yielded 373 mg (37.6%) of the title compoundas a dense powder. GPC (DMF, 50 mM LiBr) Mn=2,022 Da, Mp=1,906 Da,PDI=1.05; Purity (HPLC)=98.7%.

Example 43—Preparation of N-Butyl-NH-poly(Sar₃₀)-Palmitoyl

A 25 mL round-bottom flask was charged with N-butylamine (30 mg, 0.410mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (5 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 15° C.The solution was stirred and allowed to equilibrate for ˜5 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.42 g, 12.3mmol, 30 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring for 5 hours, the Sar NCA was completelyconsumed, and the temperature of the reaction was raised to 25° C.Triethylamine (572 μL, 4.10 mmol, 10 equiv.) was added to the reaction,followed by palmitoyl chloride (1.244 mL, 4.102 mmol, 10 equiv.). Thereaction was stirred overnight before filtering through a mediumporosity fritted glass funnel and rinsing with DMAc (˜4 mL). Thereaction mixture was transferred to a beaker using DMAc (2×1 mL) torinse the filtration flask. While stirring vigorously with an overheadstirrer, methyl tert-butyl ether (MTBE) (80 mL, ˜7 volumes) was addedslowly over 5-10 seconds. The precipitation was stirred for 1-2 minsbefore the stirring was stopped and the material was allowed to settlebefore collected via vacuum filtration in a medium porosity frittedglass funnel. The semi-dry material was slurried briefly on the fritwith an additional MTBE (25 mL). The material was dried in vacuum ovenat −50° C. for 2 days. This yielded 373 mg (37.2%) of the title compoundas a dense powder. GPC (DMF, 50 mM LiBr) Mn=2,101 Da, Mp=1,989 Da,PDI=1.05; Purity (HPLC)=98.5%.

Example 44—Preparation of N-Butyl-NH-poly(Sar₃₀)-Oleoyl

A 25 mL round-bottom flask was charged with N-butylamine (30 mg, 0.410mmol, 1 equiv.) and N,N-dimethylacetamide (DMAc) (5 mL). The reactionflask was then placed in a jacketed reaction beaker equipped to acirculating isopropanol/water bath with the temperature set to 15° C.The solution was stirred and allowed to equilibrate for ˜5 mins beforethe addition of sarcosine N-carboxyanhydride (Sar NCA) (1.42 g, 12.3mmol, 30 equiv.). IR spectroscopy was used to monitor the reactionprogression via disappearance of the carbonyl stretches at ˜1850 and1778 cm¹. After stirring for 5 hours, the Sar NCA was completelyconsumed, and the temperature of the reaction was raised to 25° C.Triethylamine (572 μL, 4.10 mmol, 10 equiv.) was added to the reaction,followed by oleoyl chloride (1.356 mL, 4.102 mmol, 10 equiv.). Thereaction was stirred overnight before filtering through a mediumporosity fritted glass funnel and rinsing with DMAc (˜4 mL). Thereaction mixture was transferred to a beaker using DMAc (2×1 mL) torinse the filtration flask. While stirring vigorously with an overheadstirrer, methyl tert-butyl ether (MTBE) (80 mL, ˜7 volumes) was addedslowly over 5-10 seconds. The precipitation was stirred for 1-2 minsbefore the stirring was stopped and the material was allowed to settlebefore collected via vacuum filtration in a medium porosity frittedglass funnel. The semi-dry material was slurried briefly on the fritwith an additional MTBE (25 mL). The material was dried in vacuum ovenat ˜50° C. for 2 days. This yielded 792 mg (78.2%) of the title compoundas a dense powder. GPC (DMF, 50 mM LiBr) Mn=2,340 Da, Mp=2,103 Da,PDI=1.11; Purity (HPLC)=98.6%.

Example 45—Preparation of Tetradecyl-NH-poly(Sar₂₃)

Following the general procedure of Example 17 with the following reagentequivalents and amounts: tetradecylamine (407 mg, 1 equiv.), sarcosineNCA (5.05 g, 23 equiv.), DMAc (35 mL). This yielded the title compoundas a dense white solid (3.2 g, 90.8%). GPC (DMF, 50 mM LiBr) Mn=1,919Da, Mp=2,010 Da, PDI=1.02.

1. A composition, comprising: (i) a polymer of Formula I:

or a salt thereof, wherein: R^(1a) is an optionally substituted(C1-C20)aliphatic group; R^(1b) is H or an optionally substituted(C1-C20)aliphatic group; R² is H or an optionally substituted(C1-C20)aliphatic group; x is 5-250; and (ii) a protein.
 2. Thecomposition according to claim 1, wherein x is 5-90.
 3. The compositionaccording to claim 1, wherein x is 5-50.
 4. The composition according toclaim 1, wherein the polymer has the structure of Formula II:

or a salt thereof, wherein: R is an optionally substituted(C12-C20)hydrophobic aliphatic group; and x is 5-50.
 5. The compositionaccording to claim 4, wherein: R is CH₃—(CH₂)_(y)—; and y is 11-19. 6.The composition according to claim 4, wherein: R isCH₃(CH₂)₇CH═CH(CH₂)₇CH₂—.
 7. The composition according to claim 1,wherein the polymer has the structure of Formula

or a salt thereof, wherein: R^(1a) is an optionally substituted(C6-C20)hydrophobic aliphatic group; R^(1b) is an optionally substituted(C6-C20)hydrophobic aliphatic group; and x is 5-50.
 8. The compositionaccording to claim 7, wherein: R^(1a) is CH₃—(CH₂)_(y)—; R^(1b) isCH₃—(CH₂)_(z)—; y is 5-19; and z is 5-19.
 9. The composition accordingto claim 1, wherein the polymer has the following structure:


10. The composition according to claim 1, wherein the polymer has thefollowing structure:


11. The composition according to claim 1, wherein the polymer has thefollowing structure:


12. The composition according to claim 1, wherein the polymer has thefollowing structure:


13. The composition according to claim 1, wherein the polymer has thefollowing structure:


14. The composition according to claim 1, wherein the polymer has thefollowing structure:


15. The composition according to claim 1, wherein the polymer has thefollowing structure:


16. The composition according to claim 1, wherein the polymer has thefollowing structure:


17. The composition according to claim 1, further comprising one or moreof water, a preservative, and a pH adjuster.
 18. The compositionaccording to claim 1, further comprising one or more of water, apreservative, and a pH adjuster.
 19. A composition comprising: (i) apolymer of Formula IV:

wherein: R^(1a) is an optionally substituted (C1-C6)aliphatic group;R^(1b) is H, or an optionally substituted (C1-C6)aliphatic group; R² isan optionally substituted (C11-19)hydrophobic aliphatic group; x is5-50; and (ii) a protein.
 20. The composition according to claim 19,wherein: R² is —(CH₂)_(y)—CH₃; and y is 10-18.
 21. The compositionaccording to claim 19, wherein: R² is —(CH₂)₇CH═CH(CH₂)₇CH₃.
 22. Acomposition, comprising: (i) a polymer of Formula I:

or a salt thereof, wherein x is 5-90; and (ii) a protein.
 23. Thecomposition of claim 22, wherein x is
 10. 24. The composition of claim22, wherein x is
 15. 25. The composition of claim 22, wherein x is 20.26. The composition of claim 22, wherein x is
 25. 27. The composition ofclaim 22, wherein x is
 30. 28. The composition of claim 22, wherein x is35.
 29. The composition of claim 22, wherein x is
 45. 30. Thecomposition according to claim 22, further comprising one or more ofwater, a preservative, and a pH adjuster.